Under Siege 2 (1995)

Casey Ryback (Steven Segal) is traveling with his niece (Katherine Heigl) on a train, which is hyjacked by terrorists. The terrorists need a moving headquarters, so they can take over a satilite capable of vaporizing anything in its path. The government can't stop them from destroying Washington and also rupturing a nuclear reactor, killing millions. Casey Ryback uses his Navy-Seal training to take out all of the terrorists in an action-packed ride.