Might be late, but FYI Colton:
457.900 is the Colton Car Herder
AAR 96 161.550 UPLA Dispatcher 30 - Rancho to North Montclair.
AAR 42 160.740 UPLA Dispatcher 50 - North Montclair to CP Yuma Junction (LA)
AAR 96 161.550 Yardmaster/Switching - Shops Yard.
AAR 44 160.770 Crest Conductor/Switching - City of Industry
AAR 66 161.100 Trim Herder - West Colton - Lots of "Man Down" testing of late.
AAR 88 161.430 Crest Herder - West Colton
AAR 24 160.470 Hump - West Colton
Grandpa Fred's last yard

Spent a lot of time there after it opened, listening to freight conductors tell stories.
There is also a defect detector in Loma Linda (MP 543.1) you might hear once in awhile