Every locomotives that comes out of either Erie, PA (GE) or London, ON (EMD) has a unique serial number stamped somewhere on the frame (called a frame number). This can be useful for railfans because, if a frame number can be found, the original unit to roll out of the factory can then be identified. Here is the frame number on UP 1350 (originally DRGW 3100). The number is 7360-7.
(Photo taken with Union Pacific Permission during an official tour with the Rocky Club)
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