What is the name of this 40's (?) movie? About an affair?

I hope someone can help me out with this as I am drawing a total blank. I think it was made in the 1940’s but it could have been earlier (or later for that matter.)

I want to say it starred Leslie Howard, Joseph Cotton or someone like that. ( I may be totally off here.)

It’s a movie about two married people (I think?) and they meet at a train station. It’s in black and white. I won’t give the plot here because I don’t want to write a spoiler. I just know that they meet at a train station cafe (perhaps?) and this is how the affair starts.

Any ideas?

Thanks in advance!