Top Definition
Someone on a train who gives you a vein, because something they are doing is annoying you, perhaps even their face!
"That person over there is the ultimate vein on a train."

"I wish that person would turn their music off, they're becoming a vein on a train."

"Why does she feel the need to constantly purse her lips, she is a massive vein on a train."
by Leonard Bott III May 17, 2008
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