Typical hot and humid south Texas railfanning. Having eyed this set all afternoon amongst 3 other power sets laying over, we waited until the outbound crew of the 545 started out of the e/f, wanting to get as much sun on the trucks as possible. Pacing the power movement at a slight jog, the set slowed and stopped to throw the mainline switch; just long enough to roll off a few yards of K25. With the Santa Fe having VERY few pure U36Cs in kodachrome, this was a prize that we relished for a long time.