Blocker Train

The fastest, longest "fuck you" on wheels.

An inconveniently-placed train that either threatens to get in someone's way or is already an obstacle. This almost exclusively happens when at least one person is in a rush and need a Plot Screw to slow them down, so God sends in a train to put a stopper in their way. If this is happening during a Chase Scene, it's more likely the chased is the one put behind the train than the chaser to intensify the sense of danger. If someone needs to be Gotta Be Unlate, then a Blocker Train will only infuriate them and make them more likely to be late for whatever they're rushing to.