The mystery that was left untold in the TV series will be revealed in the movie.

2100A.D. The world has entered a new age of super high-speed railways. The World Railway Conference has introduced the Laser Rail, a whole new form of travel in which trains are no longer confined to the ground. 
To operate on the Laser Rail, the Train Base is established. Here, trains from across the globe, installed with artificial intelligences and robot bodies. Thus the Train Heroes are born. 
Within the Train Base, these Train Heroes undergo strict training sessions. On occasion, they are called upon to assist in disaster rescue and relief. 
Note: This is a joint Japan-China project. Collaboration between TV Tokyo and Carloon Animation Company (Chanzhou, China). 
(Source: AniDB)

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