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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.