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Japanese Train Through-Services & Fare Adjustment: 2026 Transit Guide

How Japanese through-trains work (Chokutsu Unten). Learn how to exit fare gates, use yellow Fare Adjustment Machines (Seisanki), and handle pass errors.

R RoamFYI Editorial Team
• • Updated: Sep 18, 2026
🛡️ Independent & Reader-Supported: RoamFYI publishes verified on-the-ground transit intelligence. When you book through our links, we may earn an affiliate commission at no extra cost to you. Disclosure policy.
⚡ Key Takeaways & Quick Summary
  • ✓Through-Service (Chokutsu Unten / 直通運転) means a single physical train seamlessly switches from one company's tracks onto another private railway without passengers changing seats.
  • ✓Common Pass Error: If you board a subway using a Tokyo Subway 24/48/72-Hour Pass and the train continues onto a private railway (like Tobu or Keikyu), your pass will cause a red gate error upon exiting.
  • ✓Yellow Fare Adjustment Machines (Seisanki / 精算機) located right before exit fare gates allow you to insert your ticket or pass and pay only the difference (Norikoshi) in cash or IC card.
  • ✓If traveling on an IC Card (Suica/Pasmo/ICOCA): The entire multi-company journey is calculated and deducted automatically at the destination gate with zero manual action required.

One of the most efficient—and occasionally confusing—features of Japan’s rail network is Through-Service (Chokutsū Unten, 直通運転).

Under this system, a single train changes operators mid-journey: what begins as a Tokyo Metro subway line can seamlessly transform into an outdoor suburban private railway without you ever getting off the train.

However, if you are using tourist passes like the Tokyo Subway 72-Hour Ticket, passing beyond the subway boundary causes an immediate red turnstile lock at your destination.

This practical guide explains how through-services work and how to effortlessly adjust your fare using station Fare Adjustment Machines (Seisanki, 精算機).

1. What is Through-Service & Why Does It Exist?

Tokyo and Osaka avoid bottleneck platform transfers by linking underground municipal subways directly to private suburban commuter lines:

flowchart LR
    Metro[Tokyo Metro Subway Network] -->|Continuous Track| Boundary[Boundary Station e.g. Nakameguro / Oshiage]
    Boundary -->|Same physical train continues| Private[Private Suburban Rail e.g. Tokyu / Tobu / Keikyu]

Famous Examples of Tokyo Through-Services:

  1. Hibiya Line (H): Nakameguro (Subway) ➔ Kita-senju ➔ continues onto Tobu Skytree Line towards Saitama.
  2. Asakusa Line (A): Haneda Airport (Keikyu Line) ➔ Sengakuji (Subway) ➔ Oshiage ➔ continues onto Keisei Line towards Narita Airport.
  3. Fukutoshin Line (F): Motomachi-Chukagai (Minatomirai Line) ➔ Shibuya (Subway) ➔ Ikebukuro ➔ continues onto Tobu Tojo Line / Seibu Ikebukuro Line.

2. The Golden Rule: IC Cards vs Tourist Subway Passes

How through-services affect your payment depends entirely on what ticket media you are holding:

Payment MethodRiding Across Boundaries (e.g. Subway ➔ Private Railway)Action Required at Destination Gate
Digital Suica / Pasmo / ICOCASeamlessly calculated across all private & metro operatorsNone. Simply tap at the destination exit turnstile. The total combined fare is auto-deducted.
Tokyo Subway 24/48/72-Hour PassCovers ONLY the subway portion of the rideGate will beep RED. Must pay the private line supplement at the yellow Fare Adjustment Machine.
Paper Single-Ride TicketTicket value covers only initial fare distance purchasedGate will beep RED. Insert ticket into Fare Adjustment Machine and pay the fare difference.

3. Step-by-Step: Using the Yellow Fare Adjustment Machine (Seisanki)

If your ticket or tourist pass triggers a red gate error upon exiting:

Transit Decision Route

Adjusting Fare at Japanese Station Exit Gates

Total Time 1–2 mins
Est. Cost Exact unpaid fare difference (¥150–¥400)
1
🚶

Locate the Yellow 'Fare Adjustment' Machine (精算機)

Inside Fare Gates Concourse
⏱️ 30 secs

Step away from the turnstile and look for the yellow or dark blue automated kiosk located immediately next to the manned station booth.

2
🚇

Insert Pass / Ticket & Select English

Fare Adjustment Screen
⏱️ 30 secs • 💰 Fare Difference

Tap the 'English' button in the upper right corner. Insert your paper ticket, Tokyo Subway Pass, or IC card into the flashing slot.

💡
Pro Tip: The computer screen automatically calculates the exact additional fare required from the line boundary station to your current exit station.
3
🚶

Pay Difference & Collect Adjusted Exit Ticket (Seisanken)

Exit Turnstile
⏱️ 30 secs

Insert cash coins/bills or tap an IC card to pay the difference. The machine dispenses an adjusted ticket (精算券, Seisanken). Insert this ticket into the exit gate turnstile to walk through.

4. Useful Station Phrases for Manned Windows

If you prefer speaking to the station attendant at the manned glass booth (Kaisatsu-guchi, 改札口):

  • Phrase: 乗り越し精算をお願いします。
  • Romaji: Norikoshi seis-an o onegaishimasu.
  • English: I would like to pay the fare adjustment for riding past my ticket limit.

Hand the attendant your subway pass and your destination station name; they will tell you the exact coin amount to pay (or allow you to tap your Suica for the difference).

❓Frequently Asked Questions

What does 'Through-Service' (直通運転) mean on Japanese trains? ▼
Through-Service is a collaborative operational system where trains run continuously across multiple railway networks owned by different companies. For example, a Tokyo Metro Hibiya Line subway train continues directly onto the private Tobu Skytree Line, allowing passengers to travel from Roppongi to Saitama without switching trains.
Why did my Tokyo Subway Pass give me a red error light at the exit gate? ▼
Because you rode beyond the Tokyo Metro/Toei Subway boundary onto a connecting private railway (e.g. Tobu, Odakyu, Keisei, or Keikyu line). The Tokyo Subway Pass only covers subway tracks. To exit, visit the yellow Fare Adjustment Machine or manned window to pay the fare for the private line segment.
How do I use a Japanese Fare Adjustment Machine (精算機, Seisanki)? ▼
Before walking through the exit gates, find the yellow kiosk labeled 'Fare Adjustment' (精算機). Tap 'English', insert your original ticket or subway pass, and the screen displays the exact unpaid balance. Insert coins/bills or tap your IC card to pay. The machine dispenses an adjusted ticket (Seisanken) to insert into the exit turnstile.
What should I do if my IC card (Suica/Pasmo) has insufficient funds at the exit gate? ▼
If the exit gate beeps red and displays 'Insufficient Balance', step back and insert your IC card into the yellow Fare Adjustment Machine (or any pink recharge machine inside the gates). Add at least ¥1,000 (or the exact needed shortage), retrieve your card, and tap the exit gate normally.