Search found 1 match: Clive Owen

"Children of Men" (2006) might be it. There is a scene close to the one you described. A man (Clive Owen) is tasked with getting a pregnant black woman (Clare-Hope Ashitey) to a ship off the coast of England in a dystopian future where humanity has become infertile and civilization has for the most part fallen to pieces. The scene that comes close is when Owen's character first meets Ashitey's character, which I believe took place in a barn and not a shed, and she removes her blouse to reveal she is pregnant. I don't remember if there were railroad tracks at that particular scene but there are numerous scenes in the movie that take place on trains or near railroad tracks. Either way it is a great movie, in my opinion, if you haven't seen it yet.