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Somewhere under a mountain in Gunma, a staircase disappears into the dark and does not stop for ten minutes. At the bottom sits a platform, cold and lit like a corridor in a submarine, served by only a handful of trains each day. This is Doai Station, an unstaffed JR stop on the Joetsu Line where the downbound platform lies deep inside a tunnel, roughly 486 steps below the entrance. It is widely known as Japan's "mole station." Our latest JRPass guide covers the descent, the tunnel history behind it, and how to actually visit.
Special update: You can now buy single rail tickets for Japan’s Golden Route on JRPass.com - single fares, one-way, fully digital, including the Shinkansen 'bullet' train. 
Quick Answer — What Is Doai Station?
Doai Station is an unstaffed JR East station on the Joetsu Line in Gunma Prefecture, on the route between Tokyo and Niigata. Its downbound platform sits deep inside a mountain tunnel, reached only by a staircase of around 486 steps, which has earned it the nickname "Japan's mole station." Sources quote 462 or 486 steps because the tunnel staircase has 462, while the full route from the gate adds 24 more. The upbound platform, by contrast, sits at ground level beside the triangular-roofed station building. 
The 486 Steps
Doai's route to the deep platform is 486 steps long, and the descent breaks down like this:
- Ticket gate to tunnel entrance: A covered 143-metre walkway crosses Route 291 and the Yubiso River, with 24 steps.
- Tunnel entrance to platform: A 338-metre staircase of 462 steps follows, with a landing every few steps.
- Total steps, gate to platform: The full route covers 486 steps and drops about 70 metres.
- Time on foot: Allow about 10 minutes down and 15 or more back up, with no lift or escalator.
Those figures match the signboards inside the station, while JR East's Doai Station timetable shows just how sparse the service is here, with only around five local trains a day in each direction.
What most visitors remember, though, is the air rather than the number: it turns cold and faintly damp a few dozen steps in, and the sound of running water echoes off bare concrete all the way down.
Why It's Built This Way
Doai's split-level layout comes down to two separate tunnels doing two separate jobs:
- Shimizu Tunnel (opened 1931): A single track carries trains south toward Minakami and Tokyo, and its platform sits at the surface.
- Shin-Shimizu Tunnel (opened 1967): A single northbound track runs on a lower, straighter route, so its platform had to be built inside the tunnel itself, about 70 metres below the station building.
In short, Doai has two directions, two tunnels, and two platforms at two very different depths. The same mountains later carried the Joetsu Shinkansen, which runs through its own 22-kilometre Daishimizu Tunnel on the way to Niigata's heavy snowfields. That tunnel sits even lower than Doai's deep platform, as each generation of engineers dug deeper to flatten the climb over the range.
Visiting Doai
Doai is a 9-minute Joetsu Line ride north of Minakami, but catching one of its rare trains takes planning:
- Frequency: Only around five local trains a day run in each direction, with gaps of up to four hours.
- Getting there from Tokyo: A Shinkansen to Takasaki and a Joetsu Line local train via Minakami takes about 2.5 hours, from around ¥5,700 one way.
- What's nearby: The Kissa Mogura café occupies the old station office, DOAI VILLAGE glamping sits beside the station, and the Tanigawadake Ropeway area is roughly 20 minutes on foot.
Doai is unlikely to be your only stop on a Joetsu Line day out, so it is worth weighing whether a nationwide or regional rail pass suits your route better before booking. If you do buy a pass and Doai falls early in your trip, an airport Meet and Greet service can handle the exchange and seat reservations, so the journey north to Minakami starts smoothly.
Mt Tanigawa itself falls within Joshin'etsu-kogen National Park, one of Japan's largest national parks, and some hikers use Doai as a starting point for its trails. Facilities like the café and glamping site change quickly at rural stops, so confirm opening days locally rather than planning a visit around them. If you are heading into the mountains with limited signal, a pocket Wi-Fi rental is worth arranging in advance so you can still check train times and trail conditions on the day. 
Japan's Other Strange Stations
Koboro, Seiryu-Miharashi and Obasute (pictured above) are three other stations that rail fans rank alongside Doai for sheer strangeness:
- Koboro Station (Toyoura, Hokkaido): This Muroran Main Line stop sits wedged in an 80-metre gap between two tunnels, with no road access at all.
- Seiryu-Miharashi Station (Iwakuni, Yamaguchi): This Nishikigawa Railway viewing platform over the Nishiki River has no entrance or exit, and only special event trains stop there.
- Obasute Station (Chikuma, Nagano): This JR Shinonoi Line switchback station (pictured above and below) overlooks the Zenkoji Plain, one of Japan's three finest train-window views (as seen below).
Each is worth its own detour, but none quite matches Doai's combination of depth and drama.
Etiquette at Remote Stations
Doai runs on the same unstaffed logic as much of rural Japan, and these practical tips for rural train travel are worth knowing before you arrive:
- Take a boarding certificate from the machine at the station, since Doai has no ticket machines or staff.
- Carry cash for your fare, as Suica and other IC cards cannot be used at Doai Station.
- Wait toward the Tokyo end of the platform, since short trains may not reach the far end.
- Stay well back from the platform edge in the tunnel section, where lighting is dim and passing trains can be fast.
Why Rail Fans Pilgrimage Here
Rail fans come to Doai because it is Japan's deepest station, a prize within the wider culture of train enthusiasts. It's a scene with its own vocabulary, for people who photograph trains, ride them for their own sake, or collect strange stations the way others collect stamps. For that crowd, a detour like this rarely happens in isolation. It tends to sit inside a looser slow-travel itinerary through rural Japan, where the journey is the point, not just the destination.
Many rail fans pair Doai with longer journeys along the Tokyo–Kyoto–Osaka corridor, where point-to-point train tickets can be booked digitally rather than at a station counter, making self-planned trips easier to piece together. What keeps people coming back to Doai specifically is something no ticket can sell: an experience you have to earn on foot, with no shortcut and often hours until the next train.
FAQs
Most questions about Doai come down to the stairs, the sparse timetable, and getting there.
Q: What is Doai Station?
A: It is an unstaffed JR East station on the Joetsu Line in Gunma, known for a downbound platform buried deep inside a mountain tunnel.
Q: How many steps do you have to climb at Doai Station?
A: There are 486 steps from the ticket gate to the deep platform, including 462 in the tunnel staircase, covering a drop of about 70 metres.
Q: Why is Doai Station built underground?
A: The northbound Shin-Shimizu Tunnel, opened in 1967, follows a lower route than the original line, so Doai's platform for that direction sits deep inside the mountain.
Q: Why is Doai Station called the "mole station"?
A: The nickname comes from passengers having to climb up out of the tunnel to reach daylight, much like a mole emerging from underground.
Q: Can you use Suica at Doai Station?
A: No, IC cards cannot be used at Doai, so take a boarding certificate at the station and pay your fare in cash.
Q: Do all trains actually stop at Doai Station?
A: The regular local trains all call at Doai, but only around five run each way daily, so check the timetable first.
Q: Is Doai Station still an active train station?
A: Yes, it remains in operation, though as an unstaffed stop with a limited number of daily services in each direction.
Q: Is there a café at Doai Station?
A: Yes, the Kissa Mogura café runs in the old station office beside DOAI VILLAGE glamping, though opening days vary, so confirm before visiting.
Q: How do you get to Doai Station from Tokyo?
A: Most travellers take the Shinkansen to Takasaki, then Joetsu Line locals via Minakami. From Jomo-Kogen, a bus to Minakami comes first.
Q: What is Japan's strangest train station?
A: Doai is a strong contender, alongside oddities like Koboro Station, which has no road access, and Seiryu-Miharashi, which has no entrance or exit at all.
