Caught on a Train (1980)

Synopsis
Over the course of one night and many miles, the lives of three passengers aboard a trans-European train are changed forever. English businessman Peter (Michael Kitchen) finds to his amazement that the friendship he's struck up with a carefree American woman called Lorraine (Wendy Raebeck) is quickly turning into something far more involved. Meanwhile, an older and demanding Viennese woman named Frau Messner (Dame Peggy Ashcroft) seems to have every intention of trying Peter's patience until they all witness its end. ~ Cammila Albertson, All Movie Guide