There is generally a conductor who can be identified by such aggressive phrases as "Where's your beer bro?" and "Come on bro, one more round!" The opposite of this is the caboose, who tags along at the end of train, asking where the train is going and getting paper towels for the pong table.
"Oh you know, the bro train is rolling over and we're going to power hour or maybe play bet your liver"
Named after the fact that said bros usually start and finish every sentence with "Bro!", such as in "Bro bro bro! Bro, that skank totally wanted to bang you bro!"
Most bro trains are delayed at Jamaica Station because of fights that break out on the train.
Avoid the bro train at all costs!