Three companies, one map: the Tokyo transfer that charges you a second base fare

The gate at Ōtemachi takes your tap without complaint, the panel flashes a fare, and you walk on. It is only later, adding up a day of short hops, that the arithmetic surfaces: you paid a fresh starting fare four times to cross a city that looked, on the map, like one continuous web of coloured lines.

Three companies wearing one map

Tokyo's rail network is drawn as a single diagram, but it is operated by rivals. JR East runs the Yamanote loop and the arteries that cross it. Tokyo Metro runs nine lines beneath the centre; Toei runs four more. Beyond them sit the private railways — Odakyu, Keio, Tokyu, Tobu, Seibu, Keikyū, Keisei — each with its own track, its own gates, its own fare table.

Every operator charges a base fare, the hatsunori unchin (初乗り運賃), the moment you enter its gates. JR East's starts at 146 yen on an IC card for the shortest ride inside the city. Tokyo Metro's starts at 178 yen, Toei's at 178 as well. Cross from one company into another and the meter does not continue — it starts over. A journey stitched from three operators pays three opening fares before distance is even counted.

The train that crosses the border without stopping

What hides this is a Tokyo speciality: sōgo chokutsū unten (相互直通運転), through-service, where one operator's trains run straight onto another's tracks. You board a Tokyo Metro Chiyoda Line train at Ōtemachi and stay in your seat as it becomes an Odakyu train past Yoyogi-Uehara, carrying you toward Shimokitazawa without a change. On the Fukutoshin Line, the same carriage takes you from under Shinjuku out onto the Tokyu Tōyoko Line and down to Yokohama. Nothing announces that you have changed companies. The fare, quietly, has.

The clearest case runs airport to airport. A single Toei Asakusa Line service can leave Keikyū rails at Haneda, pass through the Toei subway, and continue onto Keisei track toward Narita — three operators, one unbroken ride, three base fares folded into the total. Convenient beyond argument. Just not one fare.

Where the fare actually resets

Some seams are gentler than others. Transfer between Tokyo Metro and Toei — the two subway systems — and a norikae (乗り換え) discount of 70 yen comes off the combined fare, an acknowledgement that they share the underground. Between JR and any subway there is no such mercy: two full base fares. This is why a route that a maps app offers as the fastest can cost noticeably more than a slightly slower one that stays on a single operator the whole way.

The tap is silent about all of this, which is its danger and its grace. Your IC card never refuses the transfer or explains it; it simply deducts. To read the seams before you travel, a transit app such as Jorudan or Norikae Annai (乗換案内) lays out each leg with its operator and its fare, and lets you sort by cost rather than by minutes.

乗り換えのたびに初乗り運賃がかかる、とだけ覚えておけばいい。

The pass that changes the sum

If your day leans on the subways, the arithmetic can be pre-empted. The Tokyo Subway Ticket — sold to visitors on a foreign passport at Haneda and Narita arrivals, at some hotels, and at Bic Camera counters — covers unlimited Tokyo Metro and Toei rides for a fixed window: 800 yen for 24 hours, 1,200 for 48, 1,500 for 72. Four subway hops in a day clear the 24-hour price; a museum-and-neighbourhood day clears it without effort. It buys nothing on JR, so it rewards one particular shape of trip — one that lives underground on the two subway networks and leaves the Yamanote loop alone.

Getting it right, and the one mistake

Plan the day by operator, not only by minutes. When two routes arrive within five minutes of each other, the one that stays on a single company is usually the cheaper, and across six or seven hops the gap adds up to lunch. Keep an IC card — Suica or Pasmo — topped up so the gates never stall you at a transfer, and let a fare-sorting app, rather than the default fastest route, choose your path on the days the price matters.

The mistake to avoid is treating a through-service train as a single fare because it is a single train. The carriage that carries you seamlessly from Shibuya to Yokohama has quietly crossed from Tokyo Metro onto Tokyu, and charged you for both. If you are riding one of these lines to its far end, check where the operator changes; now and then, stepping off at the boundary station to re-board a same-operator train, or taking a different line entirely, spares you a second opening fare. The convenience is real. It is simply not free.