The engineer on a westbound Union Pacific freight waves to the conductor of a UP local who is performing a "roll by" inspection as the freight passes through the Mojave Desert behind SP SD40T-2, a Rio Grande GP40, a UP SD40-2 and a MP SD50. The local has a pair of SP SD40T-2s, with SP 8352 on this end. And all of this is traveling on BNSF Railway's Cajon Sub.
For a few years after the UP-SP-DRGW-CNW-MP-WP-MKT mergers, the UP operated very unpredictable, but colorful, sets of power across their system.
