Age of Steam Expansion - Japan made was made available as a free print-and-play expansion for the Age of Steam base game.
This map is intended to be played with 3 or 4 players, with the map reputedly playing best with 3.
Japan features high terrain building costs, including many mountains, and water hexes that can be bridged for a $6 build.
The Locomotive action has been underpowered, providing a temporary +1 link bump only for the turn it is selected. Urbanization's city upgrade also costs as one of a player's track builds.