Good News for Commuters: Seoul Subway Line 9 to Be Less Packed

If you're a working professional who has lived in Seoul for over a decade, you'll know the dread of commuting on Line 9 during morning rush hour. Few lines deserve the label 'hellish commute' quite like it. The express train from Gimpo Airport towards Gangnam, in particular, feels like a war zone. It's so bad that there's an old joke: if you try to read a newspaper on Line 9, you can't tell if you're reading it or the person next to you is reading it over your shoulder.

But this situation is slowly improving. Measures that the Seoul Metropolitan Government has been diligently working on for a long time to tackle congestion on Line 9 are starting to show tangible results this year. It's not just about adding more carriages; they're systematically revamping the entire operating system to make it more efficient. The days of being squeezed into a train with barely any room to stand might soon be over.

Line 9 Gets Some Breathing Room: Train Frequency Has Changed

The most noticeable change for commuters is the shorter headway during morning rush hour. Since March 2024, the city has been operating the line with an additional 3 train sets (18 carriages) during weekday peak hours, reducing the gap between trains to 3 minutes and 10 seconds, which is 15 seconds shorter than before. Fifteen seconds might not sound like much, but anyone who knows the value of those seconds on a packed rush-hour platform will disagree. It means the crowd waiting for the next train can clear out just a little bit faster.

Furthermore, the city accelerated its plans and introduced 5 train sets (30 carriages) early, back in late 2023. As a result, crowding on the most congested section of Line 9, between Noryangjin and Dongjak stations, dropped from 199% in November 2023 to 188% in early 2024. With the addition of new trains since then, it has now fallen further to 168%. Of course, 168% is still a high figure, but there's no denying that the hellishly crowded line, which once approached 200%, is finally getting some breathing room.

Going Further, Running Denser: The Eastern Terminus Shifts to Gangdong

The changes on Line 9 don't stop here. Currently, the line ends at Jungangbogwon Hospital Station. But if you wait just a little longer, Line 9 will extend all the way to the far end of Gangdong-gu. This is because the Phase 4 extension of Line 9 (from Jungangbogwon Hospital Station to Godeok-Gangil District 1) is scheduled to open in 2028.

This new section will span 4.12km and include four new stations. Crucially, it will connect with Godeok Station on Line 5, giving residents of Gangdong-gu and Hanam City a massive boost in accessibility to the Gangnam area. Currently, they have to rely on buses or take a roundabout route via Lines 5 and 8. But after 2028, a single express train on Line 9 will bring Yeouido and Gangnam much closer. This effectively completes the transport network linking existing city centres with new job hubs in Gangdong-gu, such as the Godeok Biz Valley and high-tech industrial complexes. The city is already preparing to add 4 more train sets in anticipation of this extension.

Line 9 Crowding Ease Project by the Numbers

Here's a quick summary of the measures Seoul is implementing to improve Line 9.

• New Trains: A total of 48 carriages (8 train sets) added by early 2024.
• Shorter Headways: Weekday morning rush hour frequency improved from 3 min 25 sec to 3 min 10 sec (a 15 sec reduction).
• Reduced Crowding: Crowding level on the busiest section dropped from 199% (2023) to 168% (2024).
• Phase 4 Extension: Targeting a 2028 opening, with 4 new stations from Jungangbogwon Hospital to Godeok-Gangil.
• Enhanced Safety: Deployment of safety personnel concentrated at busy express stations like Gimpo Airport, Yeomchang, and Dangsan.

Why Line 9 is No Longer Just 'National Route 9'

It's a fun fact that South Korea's 'National Route 9' is a highway along the south coast, completely unrelated to Seoul. But in Seoul, 'Line 9' means this subway line. Just like the Tokyo Metro Chiyoda Line or U.S. Route 9, the importance of this line cutting across the heart of Seoul from east to west cannot be overstated. The city's current measures are not just about 'adding more trains'; they are the result of long-term planning that considers the wider regional transport network after the 2028 extension.

For commuters who take Line 9 to work, it seems a slightly more comfortable journey might be on the horizon. While it may not be a complete solution, the feeling of being literally 'shoved into' the train is definitely becoming a thing of the past. It's exciting to think that the winds of change, having swept through Jamsil and Gangnam, will soon reach Godeok-Gangil as well.