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Interurban / 79 metros / Tokyo

Kantō · AsiaOSM land-use zones

Tokyo

The densest rail market on earth. Everything you build competes with something that already runs every three minutes.

Steam · Mac · Windows. Not a browser.

Play Tokyo Full edition
Existing rail 6 lines · 149 stops · Tokyo Metropolitan Bureau of Transportation (Toei)
Tokyo: the 6 rail lines and 148 stations the pack starts with, over the metro's water and major roads日暮里・舎人ライナー東京さくらトラム（都電荒川線）三田線大江戸線新宿線浅草線10 km
  • 日暮里・舎人ライナー 2008
  • 東京さくらトラム（都電荒川線）
  • 三田線 1968
  • 大江戸線 1991
  • 新宿線 1978
  • 浅草線 1960

Commuter rail, Light rail, Metro — lines, stops and colours from the operating agency's published GTFS, opening years where the feed or the record gives one. Water and roads: OpenStreetMap (ODbL), Overpass extract of the playable core. 3,090,463 residents in 218 zones, pack 2020.

#Facts, figures, history

Tokyo, as the pack records it.

Population by decade, a sourced metro series scaled to the 2020 pack.
YearPopulation
1920813,874
19301,189,909
19401,618,094
19501,381,050
19602,130,437
19702,509,776
19802,556,022
19902,608,224
20002,654,102
20102,895,066
20203,090,471

The pack's sourced population series runs from 813,874 residents in 1920 to 3,090,471 in 2020.

The zones cover 1,487 km², about 2,078 residents per km², with 1,421,616 jobs at the workplace.

The pack seeds 6 playable rail/BRT/ferry lines. 浅草線 opened in 1960; 日暮里・舎人ライナー opened in 2008.

Difficulty is Forgiving.

✓What winning here takes

Six ways to win Tokyo, each set by Tokyo.

There is no score to beat. Each condition is computed from the metro as you inherit it, with the engine's own arithmetic; these are the bars the game will set on day one in Tokyo, in 2025. The blue tick is where the city stands today; the red band is where it has to get to. The run continues after you win.

  1. Transit Capitalheld for a year

    1.5%today · published share; the game uses day one
    1.5%needed · hold the inherited share, for a year

    The region's existing system carries about 1.5% of all trips. The operating rail is in the model; in the game the bar is what that system carries on day one, held for a year.

  2. Roads Unclogged

    0%today · relief before you build
    10%needed · cut in peak congestion

    Against what the region would have without your network, not against the day you started — the region grows, and holding congestion flat through growth is the harder achievement.

  3. Carbon Cut

    0ttoday · net tonnes avoided today
    61,809tneeded · net tonnes of CO₂ a year

    Scaled to this metro's 3,090,463 residents at 0.02 tonnes each — roughly what moving a few percent of the region's driving onto rail saves, after the trains are charged for their own power.

  4. Held the Lineheld for a year

    0%today · on time, before a train runs
    80%needed · on time · 65% satisfied · a year in surplus

    All three at once. The cheapest route to a surplus is cutting the service that produces the other two, so this is the condition that cannot be bought.

  5. Within Reach

    0%today · within a walk of your stops
    10%needed · of the metro within a kilometre of a stop

    The operating rail is already in the model, so coverage does not start at nothing. The bar is a tenth of the metro within a walk, or 60% more than you inherit, whichever is higher.

  6. Ten Minutes Back

    0%today · cut so far
    10%needed · off the average regional commute

    Measured on every resident, including the people who never board a train — a network that takes cars off the road shortens the drive for everyone left on it. The day-one average is the model’s first solve.

Carbon Cut's bar is 0.02 net tonnes a year for each resident, floored at 20,000. Transit Capital, coverage and the commute are taken from the network you inherit: where the pack seeds operating rail, from that system's first solve; where it does not, Transit Capital uses the model's default present-day share (floored at 1% and capped at 6%) and coverage starts from nothing. The gauges' Transit Capital tick is that default either way.

What you are given

What you are given

Every one of Tokyo's 218 zones arrives with derived numbers attached: resident population from OSM land-use shares of a sourced 2020 metro series, jobs allocated from the land-use mix, and a gravity-model home-to-work matrix. These are not US Census tracts and not LODES commute pairs — the pack says so on its provenance string.

Work trips are a gravity model from those land-use shares, labelled DERIVED, not a census commuting matrix. The streets, water and operating lines are still observed: OpenStreetMap and the agency's published GTFS.

Tokyo's operating rail — 6 lines, 149 stops — is seeded into the playable network from the agency's published GTFS: the lines run, they cost money to operate, and riders board them. Local bus stays decoration.

What makes it hard

What makes Tokyo hard

Forgiving. Dense, centred, and already used to transit — the model has something to work with on day one. You are inheriting a system, which means you inherit its shape and its operating cost as well as its riders.

And the decade changes the problem, not the vehicle list. Tokyo in 1960 is a different city from Tokyo in 2025: the pack's sourced population series (UN World Urbanization Prospects and national census) is scaled onto the 2020 zone map, so the rivers and the rail yards stay where they are.

Tokyo is in the full edition. The free game rotates through thirteen metros so you can check the model on a city you know before taking anyone's word about the other sixty-six. The full edition, $25 once, opens all seventy-nine. Buy Mac or Windows direct and an extra 30% — Valve's cut on Steam — goes to pro-urban organisations.

Play Tokyo Full edition

Sources

How the model turns these into riders, with every mechanic named →