BN 311 was one of 15 SW1500's built in January of 1973. Of the fifteen, the 310-313 were assigned to Kansas City for switching duty.
Though I have no photos of the BN 312 myself there are some on the internet.
BN 312 from 1978:
And from 1995:
After the BNSF merger the BN 312 was renumbered BNSF 3458 and repainted H1 before 2000. Photos of the BNSF 3458 can be found here:
Here is another photo of the 3458 at Havre, MT in 2008:
That was the last photo and info I could find on the 3458. No details on if it has been retired. If that information surfaces I will update.