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Simutrans

Simutrans is a cross-platform simulation game in which the player strives to run a successful transport system by constructing and managing transportation systems for passengers, mail and goods by land ( rail, road, tram, monorail, maglev), air ( airplanes) and water ( ship) between places. Like OpenTTD, Simutrans is an open source transportation game based on the Transport Tycoon idea.