Thanks to a comment, I researched this ... this locomotive was one of the GP40Xs delivered to Union Pacific (UP 90, then UP 9000, then UP 954, befo... (more)
It looks like a MASH unit did a little "battlefield repair work" to the numberboards of CP 4523. This GP38-2 with flared radiators was built in 1978 as UP GP40X 9001. It was later renumbered UP 95... (more)
The evening transfers have been heavy as of late. Tonight the CP totes another 100 car transfer behind an pair of GP38's. Note the leader sports a GP40X car body.