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Any Long Island Rail Road train that leaves Penn Station any time between 10:00PM and 4:30AM on Thursday, Friday, Saturday or Sunday night that is packed to the brim with guidos and other assorted bros and hos whom are all wasted and shouting at each other (and anyone else on the train who isn't a bro) for the entirety of the trip. 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!
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