To recieve a blowjob while riding on a passanger train.
The best place to get rail head is over in Europe because they use trains to get everywhere, or if you can't make it to Europe try Amway!!!
by F!dAr+y August 17, 2006
In South Texas, where a female gives her man head on a railroad track (usually near a trailer park). Railroad Blow TPT Railblow Blow Track
Dude, Shanay gave me railhead beforez school this morning.
by E-Bra March 17, 2008

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