D&RGW K-37 #492 & K-36 #484, Piedra River near Gato, Colorado, August 19, 1965, photo by Chuck Zeiler
Detailed Description:
D&RGW K-37 492 & K-36 484 crossing the Piedra River near Gato, Colorado on August 19, 1965, Kodachrome by Chuck Zeiler. I believe that 492 was the helper, and 484 was the road locomotive.