Under Siege 2: Dark Territory (1995)

Maniacal techno-expert Travis Dane hijacks a train and converts it into a command center. He seizes control of a satellite super-weapon and threatens to destroy Washington, D.C., unless his one-billion dollar demand is met. Unfortunately for him, however, Casey Ryback happens to be on board, travelling with his niece, Sarah, and is the only man between Dane and the obliteration of three million people.