Run a train: To run a train on someone is to get multiple people lined up and have sex with a single person one after the other.
To have a train ran on you is to be the willing participant waiting for each member of the train to have sex with you.
Person 1: can me and my boys run a train on you?
Person 2: yes you and your boys can run a train on me!
A euphemism for a gangbang or a gang-rape.Some here are afraid to admit that it refers to rape and say it is VOLUNTARY.It is safe to say it refers to either group sex or gang rape.This word is usually used by gangstas and thugs.
Watch the TRAINING DAY scene when alonzo stops the white kids in the gang neigbourhood.
Denzel W(Alonzo):I'ma make you walk home. I'ma let the homeboys run a train on your girlfriend. You know what a train is, don't you?