On Seoul Station and Seoullo Station, covered and uncovered railways...

Over a year ago, Seoul initiated an overhaul of Seoul Station area that left all options on the table, including covering railways and removing the Seoullo eyesore ('Tear down that Seoullo?'). Here's what they came up with for 2028.

The good news? 

• As expected, goodbye ugly tracks, hello street level vegetation and pedestrian-friendlier infrastructures.
• The original Seoul Station, now Culture Station Seoul 284, recovers its majesty (don't get me wrong, not talking about its Imperial Japan era origin - besides, the architect was inspired by the Lucerne Station in Switzerland).
  
• At least one traffic lane seems to have been removed on the Tongil-ro / Hangang-daero side, at least in front of the old station.
  
• In the same green vein as the Gyeongui Line Forest Park, railways shall be replaced by a linear park that will go all the way to Hangang. 
  

The usual caveats? High rise multipurpose buildings that will coopete with other hubs. 

On the northen section: a cluster of towers between Seosomun Park and... Seoullo?

Now something puzzles me: Seoullo 7117 is still there. Which means that the project was not fully thought through.

At least, this micro heliotropolis connected to all major means of transportation including Incheon Airport looks more integrated to its surrounding neighborhoods than all previous avatars of this decades-old project. 

***

Speaking of public transportation, another update: the elusive Seobu Line could be back on track. This key vertical LRT axis passed an important hurdle at the Ministry of Finance, but the consortium has to be reactivated. Other more or less new projects are in some kind of pipe (a few of them are familiar):

Like Goyang earlier to the north, Anyang city declared its intention to extend it to the south, along with the Wirye Line, from SNU to Anyang Sports Complex and Pyeongchon New Town. It certainly would help Anyang, but could further delay the Northern side of the Seobu Line, which remains with Pyeongchang-dong the biggest hole in Seoul's grid.

The 6 'new' lines in red on the big map above:

• Seobu Line (Saejeol - Seoul National University Entrance) - see previous posts related to it. Note two extensions (in green on the full map) to the existing network: on the Seobu Line from SNU Entrance to SNU, and on the Shillim Line from Saetgang Station to Seobu's third and easternmost station on Yeouido.

• Gangbuk Hoengdang Line (Mok-dong - Cheongnyangni horizontal) - 25.72km, 20 stations that would connect Pyeongchang-dong to the grid.
  

• Ui Line extension (Ui-dong - Banghak-dong) - 4.13km, 6 stations
  

 

• Myeonmok Line (Cheongnyangni - Sinnae-dong) - 9.05km, 12 stations
  

 

• Nangok Line (Boramae Park - Nangyang-dong)

 

• Mok-dong Line (Sinwol-dong - Dangsan Station) 
  

 

Besides, 2 existing lines are upgraded (in blue on the map):

• Line 4 (Danggogae - Namtaeryeong): express
  

• Line 5 (Dongducheon-dong - Gupundari)
  

See all posts related to Seoul Station, transports, and subways.

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GTXtension(s) - fast transit rather than mass commuting?

In case you missed it, three new projects of GTX (Great Train eXpress) lines were announced earlier this year. Since we're getting closer to the inauguration of the first section on March 30 (GTX-A from Suseo to Dongtan), but also to key elections on April 10, I'll spare you all the wonderful urban development pledges that have popped up from all sides (I guess merging Gimpo with Seoul was one of the most radical), and talk a bit more about these Great Train extensions and GTX-tensions.

By stretching ABC and adding DEF, the network reaches further North, South, West, and East, and draws a first ring around Seoul and across Gyeonggi-do (GTX-F):

If GTX clearly brings places closer together, dividing by 3 the time to join Suseo and Dongtan, and if it reaches relatively fast speeds (105 km/h in its inaugural section, with peaks at 180 km/h), the system is 'express' in the sense that it makes few stops. And so far, it has more or less managed to resist intense pressure to add intermediary stations, particularly within Seoul. 

Which makes the success of seamless multimodal transport hubs even more critical, and I'm not sure that will be the case from day one. 'Luckily', the traffic shall not be too massive, because as it is conceived now, GTX can't really handle mass commuting. 

Beyond the limited number of trains per hour, their shortness is an issue, and commuters may struggle to find a spot to hop in, particularly in intermediary stations. I've experienced rush hour on Paris region's RER, with its long, double-decker trains, and that's not always pleasant... We may not see scenes similar to Line 9 saturation on steroids, but expect at least significant frustration from a lot of people who were expecting GTX as the instant panacea.

GTX provides fast transit before mass transit, it shortens connections before coping with mass commuting, and that's already something big. Even if you won't commute to work there, simply knowing that you can go to Seoul very quickly for lunch, dinner, or on a weekend can make moving far away less alienating. 

These massive and costly extensions do add Gangwon-do (Chuncheon and Wonju) and Chungcheongnam-do (Cheonan) to the equation, but also risk of further widening the gaps between sudogwon (Seoul-Incheon-Gyeonggi) and the rest of Korea as well as within the capital region and within the capital itself. With its relatively cheap fees (KRW 3.2K + 250 per 5 km), GTX may even cannibalize such alternatives as KTX.

The choices of routes and stations is always debatable and many areas within and beyond Seoul will remain underserved, but I always welcome transversal approaches in transport, and cooperation within the capital region. Nowadays, Seoul is collaborating much closer with Gyeonggi-do, including for its Climate Card now, and a ring bringing Gyeonggi closer together and bypassing the capital altogether marks a significant step.

Somehow, GTX is forcing the emergenceof  the grand vision, the great debate that's always been lacking. The way this whole region keeps developing remains a litany of missed opportunities, particularly since most of this urban and transport development (or lack of) relied on new towns built from scratch. And you know how often I complain about so much urban planning without urbanism or planning.

Now we're hearing about covering the Gyeongin Expressway and the rift between the Eastern and Western sides of Dongtan new town, and both will cost a fortune, but the Seoul-Inchon axis dates from ages ago, and that rift should have been solved from Dongtan's very conception. As demographics plummet and finances shrink, Korea can't afford not to get it right from the beginning. 

This nation is so great at alphabets, it should contemplate beyond ABCDEF.

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7 Seoul subway / railway updates

MK published yesterday an interesting article* on the impact of 7 recent or upcoming subway / railway developments on real estate, which allows us to see of these old friends have fared since their announcements**.

The Maeil Kyeongje's 7 projects (NB our focus below doesn't follow these numbers)

 . Line 1 extension Northwards from Soyosan Station (3 new stations - Choseong-ri, Jeongok, and Yeoncheon): 

Since this extension mostly doubles an existing train, the article logically mentions a low impact on real estate. but it does make commuting more seamless for densely inhabited parts of Yeoncheon-gun, and allows Seoulites to venture further up the Dongducheon valley (not necessarily closer to the DMZ, though: it follows the same axis in this area).

 . Line 4 extension Eastwards from Danggogae Station (3 new stations - Byeollae Byeolgaram, Onam, and Jinjeop):

To be inaugurated next March, this 14.9 km extension is a game changer for this section of Namyangju dotted with major new towns (Byeollae and Jinjeop-eup). But as usual, what a shame that such major clusters were not connected to the grid from day one. 

Of course, this means more commuter traffic for a line already supporting older generation bed towns, but it will also help one of them, Nowon, grow as a cultural hub in Northeast Seoul. Furthermore, the article reminds us of two other projects that will help cope with the flow:

• Seoul considers doubling Line 4 with an express service for the 31.7 km section within city limits, between Danggogae and Namtaeryeong, with potentially 12 more stations concerned (all the ones connected to other lines). That would leave 12 stations with only the standard service, along with the ones in Gyeonggi-do.
• The extension of Line 8 Northwards from Amsa Station to Byeollae Station (Gyeongchun Line) by the end of 2023 could later be prolonged to Byeollae Byeolgaram Station via a new station, Byeollae Jungang, further anchoring Byeollae to the South, and making it a transport hub east of Seoul around a decent 'Byeollae Line' backbone.
  

 . Inauguration of Namwirye Station (Line 8):

Located between Bokjeong and Sanseong Stations in Seongnam, Namwirye doesn't really support Wirye New Town which, as the author mentions, would have much more impact. But he's not taking into account a tramway bound to deliver the goods: the construction of the Wirye Line is just starting these days.

'#Seoul about to start the construction of its first #tramway in decades (#WiryeLine - 12 stations, 5.4 km - to open i 2025). Line announced 8 years ago (http://seoulvillage.blogspot.com/2013/08/seoul-lrt-projects-update-part-22.html) #transports' (20211220 - @theseoulvillage)

 . Gyeongui Jungang Line extension Northeastwards from Imjingang Station to Dorasan Station: 

In this part of Paju, as the article confirms, 'nothing to do with real estate'. This line is simply inching further towards Kaesong, now a reasonable walk away... provided of course you've got all the papers to enter the DMZ at that most strategic point. For the moment, you're mostly connecting Seoul to a giant, empty parking lot: doesn't look like many workers will commute any time soon to the Kaesong Industrial Complex... Let's hope that some day, this dead end will be prolonged into a friendlier North Korea.

 . Seohae Line extension Northwards from Sosa Station to Wonjong Station (via Bucheon Stadium Station): 

As we've already seen (in "Twice upon a time in the West"), there's a lot going on around Bucheon. This vertical will split much earlier the traffic to/from Seoul between the North (Line 1) and the South (Line 7). And it will later be prolonged not only to Gimpo Airport, but also across the river, to Line 3 (Daegok Station, after a stop in Neunggok Station).

If Daegok seems a bit isolated between Goyang's 'old and new' New Towns (Ilsan to the West, Hwajeong to the East), Line 3 leads to more glamorous sites: downtown Seoul and Gangnam. And I wouldn't be surprised to see this new, vertical airport line that will go from Goyang to Hwaseong (for now, Ansan remains the Southern limit) venture further to the North-Northeast and connect to more New Towns.

 . Sillim Line inauguration (from Gwanaksan Station to Saetgang Station): 

Thanks to this precious new vertical connected to Line 9 (Saetbang), Line 1 (Daebang), Line 7 (Boramae), Line 2 (Sillim), 'I live in Bongcheon-dong' will sound a lot more uplifting. But in parallel to this LRT,  Western Seoul needs more verticals (Gangnam-gu already getting it's fourth!), starting with Seobu Line...

 . Shinbundang Line Northwards extension from Gangnam Station to Sinsa Station:  

The article made its headline on the star extension because it's about real estate and money, and we're talking expensive real estate (Gangnam-daero), and expensive stations: Gangnam on Line 2, Sinnonhyeon on Line 9, Nonhyeon on Line 7, and Sinsa-dong on Line 3. No new stations, but hopefully fewer cars on the Hannam Bridge once Sinbundang's next profitable extension to the North will lead across the river and Yongsan, all the way to Yongsan Station.

*

Beyond railway and subway projects, Maeil Kyeongje also mentioned work on more sections of the capital region's Second Ring Expressway, which will definitely have some impact. But what the region needs is more public transportation, and a better dialog within Gyeonggi-do, beyond the usual Seoul-suburbs dialog.

It's always good to connect existing dots, and the Ansan-Bucheon-Goyang axis is very welcome, but no new major urban projects should be allowed without a direct connection to the network.

The problem is that Gyeonggi-do is poorly managed, and this has something to do with the way big cities compete with each other without a real regional authority. Only the State has the potential to force some collaboration, or at least more coopetition and less competition within Gyeonggi-do. The lack of political will and strategic vision results in the multiplication of projects cannibalizing each other, a suicidal rat race as the population ages and declines. Clearly, there are countless ways of spending less, better, and still generating much more value for everyone.

 
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* ""딱 역 3개인데, 폭발력 엄청나다"…판교 분당 부동산 난리난 이유" (Maeil Business Newspaper 20211226)
** see "Seoul subway to gain 89 km by 2025" (June 2015), "Seoul LRT Projects Update (Part 1/2)" and "Seoul LRT Projects Update (Part 2/2)" (August 2013, following "If you ain't broke, fix it: Seoul, Welfare and Railways Deficits" - July 2013). See also all subway related posts.

Seoul 2030 - a software update

Mayor OH Se-hoon unveiled the 'Seoul Vision 2030' he announced on his inaugural address last April*, an occasion to highlight differences with his 'predesuccessor' PARK Won-soon.

By picking the slogan 'Seoul, a fair city that runs again', ever the ambitious OH delivers two not so subliminal political messages:

• I want to rally all citizens who want an end to the unfair system that's controlling local and national politics, and 
• it's not just Seoul that's moving again: I'm running again, with 2027 in sight.
  

The goal remains the same as a few months before he left office: to lift the capital into the World's top 5 cities. The difference is that since then, under PARK, Seoul has lost its momentum and regressed from 10th in 2010 to 17th last year, which makes the task all the more daunting. To foot the KRW 48 tn bill (USD 41 bn), OH bets on a surge in real estate revenues as well as on undisclosed budget trade-offs. Not sure the equation stands, but Seoul must do something to stop the bleeding as its population shrinks and its businesses struggle.

This 'Seoul Vision 2030' is more about software than about hardware. Typically, it doesn't challenge the urban planning part of 'Seoul Master Plan 2030' laid out in 2015, with its triangle of international hubs (historic center / Yeouido-Yeungdeungpo / Gangnam) and its 7 metropolitan hubs (Yongsan, Sangam-DMC-Susaek, Cheongnyangni-Wangsimni, Jamsil, Magok, Gasan-Daerim, Changdong-Sanggye). Such macro projects are freight trains that can't be rerouted at will. OH can't even stop lighter projects such as the controversial Gwanghwamun Square revamping**; only pause to adjust and adapt in order to limit the negative impacts and to improve urban continuity.

But of course, this being Seoul, a lot of real estate remains on the menu. And hundreds of thousands of new dwellings will be added to the existing oversupply.

The bad news is that redevelopment is unleashed on a large scale, with significant deregulation and the removal of key constraints (F.A.R.), and that a lot of the few remaining Seoul villages could suffer.

"Old #Seoul neighborhoods potentially open for redevelopment jumps from 14 to 50% through #Seoul's new #urbanism guidelines... brace for the worst." (20210527 - twitter.com/theseoulvillage/status/1397728062775513090)

Focusing around certain subway stations may help spare some of them, and result in Hapjeong-izing more neighborhoods (no mentions about new subway projects, but that could come, as usual, closer to next year's elections...):

"#Seoul confirms plan to 'revitalize' #subway station areas (250m radius around stations), starting with 13 pilot projects. Higher rise allowed, mixed uses residential / commercial / offices / services. Will #Hapjeong-style clusters multiply? I'd prefer more stations. #urbanism" (20210705 - twitter.com/theseoulvillage/status/1411963191089721346)

On the upside (literally), new neighborhood parks are planned in proto-urban limbos around Seoul mountains. If done properly (that's a big if), it could paradoxically protect the mountains themselves by creating sanitized but green buffer leisure spaces in stead of unlimited, littered gateways that push unruly crowds deeper into the wild. Most visitors would enjoy a pleasant moment without needing to reach any further, leaving more space to wildlife and respectful mountain lovers.

"#Seoul creates new neighborhood parks in decrepit mountainous areas where development projects have failed for 20 years, starting this year in #Cheonwangsan (#Cheongwandong and #Hangdong, #Gurogu) and #Choasan (#Changdong, #Dobonggu and later #Wolgyedong, #Nowongu). #urbanism"

(@theSeoulVillage 20210910 - twitter.com/theseoulvillage/status/1436132137258795017)

Seoul targets a 40% greenhouse gas reduction by 2030 and carbon neutrality by 2050, but to achieve that, will it continue to outsource part of the dirty job to Gyeonggi-do (see "Seoul Power Play: One Less Nuclear Plant, One More Coal Plant")?

Obsessed with Seoul's business competitiveness, OH Se-hoon wants to seize a momentum and snatch as much of the Hong Kong exodus away from Singapore as possible, and to attract FDIs getting cautious about Korea's neighbors Japan (who wants to be the next Carlos GHOSN?) and China (hard-soft power supremacy challenged worldwide, investors wary of XI Jinping's authoritarian moves). Foreign media were already flocking in before South Korea's government pushed its own laws stiffling press freedom.  In that context, the creation of an agency modeled after Singapore's EDB makes perfect sense. How it articulates with existing entities (SBA etc) remains to be seen.

How Yeouido can turn into an international finance magnet without structural reforms at the national level also puzzles me.

Like during his first mandate, OH wants to boost international tourism, this time up to 20M visitors a year. He insists on culture which is of course essential, but that will take more than a 'Seoul Festa' and kpop events.

I'm more interested in how Seoul intends to nurture and boost the local startup ecosystem, deep and wide. Hosting 40 unicorns by 2030? that's mostly for the show. Building new clusters? as if there weren't enough already... I prefer the concept of mentoring programs for seniors: recent trends already show more 50-year+ executives joining previously almost exclusively young crews, but there's a need for a much broader-reaching, more inclusive approach. 

The 5 pillars of 'Seoul Vision 2030' are "fairness, coexistence, safety***, future sensitivity, global leadership", and 'future sensitivity' is a nice way of saying the whole population should be involved, innovation requires pedagogy and respect for everyone.

"Fairness", and "coexistence" are the most beautiful and difficult challenges. Seoul aims at equal opportunity, fostering women activity and youth employment, seniors access to lifelong learning programs, Seoul Learn online education platform for underprivileged students... Basic income will even be tested. Ending the gender war among younger generations should be added as a core Seoul Development Goal.

By the way, on Thursday, the 3rd SBAU (Seoul Biennale of Architecture and Urbanism) kicked off. An anticlimatic event in a most complex climate, but always the opportunity to connect a few new dots and to confront different visions of different cities:

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* The launch of a Seoul Vision 2030 Committee was the 5th pledged made by the new Seoul Mayor:

"

The 5 pledges of #Seoul mayor #OhSehoon (NB: good luck with that):" (@theSeoulVillage 20210428 - twitter.com/theseoulvillage/status/1387308187209015300)

** see among others "Gwanghwamun Square 3.0 re-Deep-Surfaces"

*** mostly in a pandemic context.

Twice upon a time in the West

The Minister of Land, Transport and Tourism came up with a new batch of developments for the capital region*, including new public transport projects, and unfortunately more instances of Korea's failed 'New Town' model, at the very moment the country experiences a slump in housing prices, and an oversupply of dwellings. The aim is actually to make sure the prices remain low for a while, which doesn't seem a bad idea, except that in Korea's speculative zero sum game, this necessarily means more losers, and more dead neighborhoods in the short, medium, and long term.

2 'New Towns', 26 small-to-medium-sized developments, 1 BRT, 1 subway line:

Following the first three announced last year (Incheon Gyeyang, Namyangju Wangsuk, Hanam Gyosan - in blue on the map below, which also shows future GTX lines), two more 'Greenfield New Towns'** will be created one kilometer West of Seoul, one on each side of the Han River (in red):

• Goyang Changneung: 38,000 households in Deokyang-gu, Goyang (Yongdu-dong, Hwajeon-dong)
• Bucheon Daejang: 20,000 households in Ojeong-gu, Bucheon (Daejang-dong, Wonjong-dong)

In a more acupunctural approach, 26 small and medium-sized residential projects shall add 51,517 households in already developed neighborhoods:

• 19 locations in Seoul (10,000 households), including in Jayang-dong, Gwangjin-gu (1,300 households), Sadang Station, Dongjak-gu (1200 households), Daebang-dong base, Dongjak-gu (1,000 households), Chang-dong Station, Dobong-gu (300 households), Wangsimni, Seongdong-gu (299 households), Magok, Gangseo-gu (30 households)
• 7 locations in Gyeonggi-do (42,000 households)

 

Transports-wise, the government's package proposes two new public transport lines, and road extensions:

• a 17.3 km-long "S-BRT" line (NB does 'Super - Bus Rapid Transit' mean super dedicated infrastructures for buses?) between Gimpo Airport Station and Bucheon Sports Complex Station, around Gimpo Airport, with connections to subway lines 5, 9, and even 7 (Bucheon Stadium Station). It will also reach Cheongna BRT.
• a new subway line will connect Goyang City Hall to Saejeol Station (Line 6), and intersect with Line 3, GTX-A, and Gyeongui Line at Daegok Station.
• A new motorway will connect Baekseok-dong (Ilsan) to the Seoul - Munsan expressway (Gogang, Seoun interchanges).
• Susaek-ro (already hosting 3 of the new housing projects judging by the map), and Worldcup-ro shall gain layers to cope with a growing traffic towards downtown Seoul as well as towards Yeouido and Gangnam.

Bucheon's new S-BRT line around Gimpo Airport

Goyang's new subway line

The good, the bad, and the ugly:


Overall, if you consider the three announcements made since last December, the State plans to sell 73,000 homes by 2022, 67,000 in 2023, 58,000 in 2024, 61,000 in 2025, and 44,000 in 2026, which may provide more options for affordable housing, but also amplify Korea's oversupply of dwellings. The only clear winner seems to be IKEA Goyang, today an outpost, but tomorrow ideally located to serve the new town.

At least, for a change,...:

• ... Seoul intra-muros is spared from more of the large-scale New Towns that destroyed so many of its neighborhoods (including the seven buried under Gyonam New Town). 
• ... a 'Greenfield New Town'** adds some urban continuity instead of pushing urban sprawl further afield: on paper, Goyang Changneung shall better tie Ilsan to the capital.
• ... transports, including public ones, are better phased and synced with new major developments (new subway, BRT, GTX lines around Goyang and Bucheon new towns, respectively top and bottom):

This remains an absurd case where we add commuting traffic before solving existing problems upstream and downstream. Yes, commuters from the latest new town will reach Seoul faster, but they will slow down commuters from Ilsan's 'older new town', and more cars will flock into Seoul's Western bottlenecks, even if some cosmetic touches are added along Susaek-ro. Urban planners went as far in the irony as to name their concrete monstruosity after the Joseon Royal Tomb*** it will deface.

In this young millenium, any new project should aim at the very least at zero emission and zero increase in car traffic, and this is obviously not the case. I nonetheless appreciate the new public transport lines: the BRT will add some verticality and fluidity across Bucheon, and Goyang will better split its commuters between line 3 and 6.

All this also means that the construction of Seobu Line / Seobuseon becomes even more urgent (see "Seobu Line confirmed as Seoul's LRT top priority"). Just months ago, the project was delayed because SNU wanted to prolong the line further into its campus, and now a boost comes from the other end of the line, the national government speeding up the agenda, and footing the bill for the first 7 stations. Because actually, this new Goyang line constitutes the new beginning of the most defining project for the Western half of Seoul's subway network. Now hopefully, the whole line should be completed by 2026.

On the other side of the Han River, Bucheon will clearly benefit from a denser public transportation network. How the new town will coopete with Magok District or Gyeyang Techno Valley remains to be seen....


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* see for instance in Today's Chosun Ilbo: "3기신도시 고양 창릉·부천 대장동 등에 11만가구 공급", "새절역~고양시청 철도, 김포공항역~부천종합운동장역 BRT 신설", or in Today's Joongang Ilbo: "집값 다시 뛸라...집값 약세 둔화에 3기 신도시 '기습 발표'" (UPDATE 20190508 "To cool real estate, gov’t plans two new towns")
** as defined in "Wet eyes for wetlands and urban mirages"
*** see "Royal Joseon Tombs Become UNESCO World Heritage Properties" 
**** and by the way, these latest developments make even more irrelevant the Gangbuk Line project drafted a couple of months ago - see "Gangbuk LRT - Naebu v. Seobu, or PARK v. OH?")

Gangbuk LRT - Naebu v. Seobu, or PARK v. OH?

Out of the blue, Seoul Metropolitan Government unveiled a brand new, 24.8 km, 15-station subway line joining Mok-dong (Yangcheon-gu) to Cheongnyangni (Dongdaemun-gu) along the Naebu Expressway, that disgraceful overpass scarring countless Seoul neighborhoods*.

Construction would start as early as 2021, for a project that was not even part of the 10 LRT projects announced for 2025 in 2015 ("Seoul subway to gain 89 km by 2025"). Yet, it would connect the dots between two of them: the Mok-dong Line to the West (Sinwol-dong - Mok-dong), and the Myeonmok Line to the East (Cheongnyangni - Sinnae).

"서울 내부순환로 땅 밑으로 '강북횡단 경전철' 건설 추진 출처" (Chosun Ilbo 20190212)

*

As you well know, I'm all for new railway lines, but all this seems a bit hasty, if not suspicious:

• such projects usually take years and years to study, and 2021 seems a very aggressive target for starting the construction
• the route doesn't seem optimized for transportation needs, but happens to be on land mostly owned by the city, which may speed up the process
• as we've seen before, subway projects are highly political in Seoul, and countless railway projects announced before key elections have been dumped afterwards. Yet as soon as a project actually starts, land value immediately jumps
• the only date given is the start of the project, and 2021 happens to be the year preceding the next presidential elections
• this Gangbuk LRT / Naebu Line / Naebuseon could cannibalize, and maybe even kill a major project the city and many partners have been working on for a long while: the Seobu Line / Seobuseon, confirmed as a priority by the city not so long ago ("Seobu Line confirmed as Seoul's LRT top priority")
• Seobuseon was initiated under former mayor OH Se-hoon who, like his successor PARK Won-soon, hasn't given up his presidential ambitions, even if, for the moment, both are lagging behind in the polls**
• this new project is supposed to be part of Seoul's third urban railways plan, to be announced later (that's a 10-year plan, last one was for 2015-2025, maybe the plan will be revealed in 2020, but this can't wait because of the elections)
• ...

This may sound a tad cynical but again, announcements related to subways have always been heavily political (whatever the party in charge), because there's so much at stake at the real estate level, and you know how much that counts in Seoul.

*

Now, let's have a closer look at this new line. We don't have the details yet, particularly the list of stations, or how the Han River or Bugaksan shall be crossed (doubling Seongsan Bridge and the Bugak Tunnel? under the Hangang?), but we can get a more than general idea.

Comparing the new map (above) to the one featuring the previous 10 projects (see ""Seoul LRT Projects Update (Part 1/2)", "Seoul LRT Projects Update (Part 2/2)"), and of course the Naebu Expressway, here's my best guess, going from West to East:

• 'Gangbuk LRT' seems to start from the potential Ewha Womans University Mokdong Hospital station of the Mok-dong Line (west of Anyangcheon, and Dangsan Station). 
• it then seems to intersect with Line 9 at Sinmok-dong Station before crossing the river on Seongsan Bridge
• on the other side of the river, it would certainly meet Line 6 at Mapo-gu Office
• after that, it probably connects with Gyeongui Jungang Line / Gyeongui Line at Gajwa Station, and Line 3 at Hongje Station, with a couple stations in-between (at least one at the intersection of Jeungga-ro and Hongjecheon, between Yeonhui-dong and Namgajwa-dong, and one at Seodaemun-gu Office)
• we know that the new line joins the Ui-Sinseol LRT line at Jeongneung Station (Seongbuk-gu), but it would be utterly stupid to spend millions just crossing the mountain like the Naebu Expressway, and leaving Jongno-gu's Pyeongchang-dong valley completely off Seoul's railway grid. I would rather follow the road (Segeomjeong-ro / Pyeongchangmunhwa-ro), and add one station right before Inwangsan (in Hongeun-dong), and a couple in the valley itself, for example***: 
• one at the feet of Sangmyung University Seoul (Hongji-dong at Jahamun-ro), or at the Sinyeong-dong Samgeori (Segumjung Elementary School at Jinheung-ro)
• one or two at the intersection with the roads leading uphill (e.g. at Pyeongchang 20-gil)
• so far, between Mok-dong and Jeongneung, we have listed 9 to 11 stations, which leaves us 4 to 6 until the end. Judging by the map, I could add up to 5 existing stations: on Line 4 (Gireum Station), Line 6 (Wolgok Station, Korea University Station), and Line 1 (Jegi-dong Station, Cheongnyangni).

The main advantages would be to cover two big holes in Seoul's subway map: central Seodaemun-gu, and Pyeongchang-dong, and to add horizontality where it could make sense. But the Seobu Line is far better designed for the needs of Western Seoul, doubling the Naebu Expressway would demand disproportionate investments, and there are probably far smarter horizontals to build.

Of course, the fact that many cars use an urban highway doesn't mean that many citizens would take the same route by subway. Fundamentally, this top-down project doesn't seem fully thought through. I hope Seoul has a more serious and comprehensive plan to not only fix these two holes, but also pave more cleverly the (rail)way for the removal of the city's embarrassing elevated expressways.

*

Anyway, even if this project fails, and even if Mayor PARK fails in 2022, he still can run another marathon: Seoul has just been confirmed as Pyongyang's sister city in the bid for the 2032 Olympic Games (little suspense there, Busan didn't make much geographical sense):

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* most dramatically in the charming Hongjecheon valley (see "Along Hongjecheon, my way or the highway")
** in a mirror fashion, Prime Minister LEE Nak-yon leads against Seoul Mayor PARK while former PM HWANG Kyo-ahn leads against former Seoul Mayor OH (including in the race for LKP leadership later this month, with a vote expected during Trump-Kim Summit II in Hanoi):

2022 poll (JoongAng Ilbo): liberals LEE Nak-yon, RHYU Si-min, PARK Won-soon, conservatives HWANG Kyo-ahn, OH Se-hoon, HONG Joon-pyo (20190103 - twitter.com/theseoulvillage/status/1080637278605570048)

*** that's what I had in mind in the 'second circular line' project mentioned in my comment dated "August 20, 2013 at 6:00 PM"