With engineer Gosney at the throttle, Amtrak's EB California Zephyr #6 emerges from the one and only tunnel on the Martinez Subdivision, with a UP SD70m leading and 2 PV's at the rear, one being t... (more)

I am pretty sure this is the only natural tunnel on the doubletrack Cal-P mainline between Oakland and Sacramento. Shot shows westbound Capitol#544 exiting Tunnel #? at Rodeo.