Cruel Train (1995)

In wartime England, a railway official learns that the chairman of the line had sexually abused his wife as a child, then given him the job so he could continue having sexual access to her. The husband and wife kill him together, but are seen by a train driver, who also has problems of his own. The wife tries to divert suspicion by implicating another driver and befriending the witness, but it doesn't go that smoothly.

Unfortunately the movie Cruel Train is not yet available on HBO Max.