These photos are from I-20 and I-10 that parallels the former Southern Pacific mainline from Texas to California.
West of Odessa, Texas, these are the pushers that were in run-8 at about 70 MPH. The following photo shows the units that were on the front. Love the Sou-Pac GE.
Below, a GE led train screams east towards Midland-Odessa.