When all lanes on one side of a highway are occupied by vehicles driving next to each other in a line at the minimum speed limit so that no vehicle can pass them. Aptly named due to the ''train'' that forms in each lane. Attempted only by the brave due to the extreme anger and violence it can cause.
Someone is gonna beat that guy's ass for forming a doomtrain in the ultra-fast lane.
by Case in point April 07, 2004
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