A sausage rail is a line of horny guys waiting to ram the shit out of a dirty whore.
The sausage rail is what a whore rides to achieve her personal satisfaction.
Person 1: Did you hear about the whore on the 10th floor?
Person 2: Nah man. What'd that sloppy slut do?
Person 1: She rode the sausage rail for 5 hours, making 6 stops. Dan station. Bob station. Ryan station. Mark station. Pablo station and Steve station.
Person 2: Steve always gets the last of it.
Person 1: Yes, yes he does. He's a fan of meat curtains and cream pies. *sigh*