Top Definition
A great big rolling disaster. Union Pacific (UP) is a railroad whom buys greater railroads just to piss off railfans. UP has many Ex. SP units with a UPatch over the SP logo and Number.
Union Pacific is a great big rolling disaster
by WhiteDragon69 July 14, 2010
Union Pacific is an awesome railroad. It is the only class one railroad in the United States with an active steam program. The railroad owns and operates a northern and a challenger type steam locomotive. Union Pacific helped Central Pacific to build the transcontinental railroad across the United States.
I wish I could railfan the Union Pacific line.
by TorvFan March 14, 2011
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