A pair of grimy Rio Grande SD40T-2 Tunnel Motors help Amtrak’s California Zephyr with some extra power over Soldier Summit on July 7, 1988. The train is now heading downgrade through the curves at Kyune, Utah. D&RGW EMD SD40T-2 Nos. 5407 and 5366 join three Amtrak F40PHs with the long train that includes two private cars on the rear.