The Peacemaker (1997)

Factual error: The Russians stopped using steam locomotives in the 1970's. So bringing one out of retirement in 1997 to haul nuclear warheads would mean that your highly secret nuclear train would be well known among rail enthusiasts for weeks before.

Thomas Devoe: I don't know about these guys, but General Aleksandr Kodoroff doesn't ride around on a nuclear transportation train. It's like Ivana Trump on the subway.

Question: As Gavrich fled into a building being chased by Devoe and Kelly the helicopter operators informed that the (radiation) signal just disappeared. Would it really disappear so quickly?