(rail transport, slang, British) A person under a train; a person hit by a train after jumping or falling in front of it.
2002, "Tube Troll", ">Incident @ Hangar lane tube <", uk.transport.london [http://groups.google.com/group/uk.transport.london/browse_thread/thread/9a749f81e7f414b9/04825cc24c006db5?lnk=st&q=%22one+under%22+train&rnum=3#]
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