This is 1 of 10 Alco C630's bought by the UP in 1966. They were off the property in late 1973. There is some interesting history of these engines at Utah Rails. These were the last Alcos purchased by UP and the loss of UP's business probably accelerated Alco's decline.
That's a Centennial predecessor, DD35 #83, behind.
class 1's: alco's suck!