UP's westbound ZG4CI passes El Casco in the late afternoon behind UP 9639.

UP's westbound ZG4CI passes through San Timoteo Canyon in the late afternoon.

UP 7328 leads the westbound ZG4CI downgrade at El Casco.

A pair of new 9800's along with the Katy Heritage unit lead westbound symbol ZG4CI between Fingal and Cabazon.

Between Bertram and Frink out on the Yuma Sub finds UP 6946 leading the ZG4CI.

UP 7270 recently repainted without flags leads the ZG4CI at El Casco.

No longer the Boy Scouts of America unit, UP 2010 in new flagless paint leads the westbound ZG4CI at El Casco.

A crummy UP leads a trio of pool units on a westbound Z at El Casco.

UP 7261 in new paint leads a westbound ZG4CI just west of El Casco.

Westbound ZG4CI races west behind the 2558.

UP 8478 pauses at Wellton, AZ on it's way west leading the ZG4CI.

UP 8478 with the new nose shield leads the westbound ZG4CI at Mohawk.

UP SD70ACe-T4 #3089 brings up the rear of a westbound Z train near Ordway in San Timoteo Canyon.

UP 8679 west in late afternoon light near El Casco in San Timoteo Canyon.

UP 8679 sporting a fresh coat of paint, flagless! Looks sharp!