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From Liquipedia Counter-Strike Wiki
de_train − competitive map supplied in Beta 5.0.
Counter-Terrorists: Prevent Terrorists from bombing the nuclear payloads on two trains. Team members must defuse any bombs that threaten the payloads.
Terrorists: The Terrorist carrying the C4 must destroy one of the payloads.
Other Notes: There are 2 payloads on the trains in the mission.
The original map featured plain textures derived from Half-Life and the conflict was taking place in an industrial setting with a train station. Some of the sounds heard throughout the map were the engines of a plane, similar to cs_747.