Amtrak #5, the westbound CALIFORNIA ZEPHYR, curves between Tunnels 2 and 3 on UP's Moffat Tunnel Subdivision just west of Plain, July 31, 1997, 10:35 a.m. This is the same fill that washed away in the Colorado floods the week of September 9, 2013. UP forces are currently busy trying to fill the 150-foot deep hole, a task that may last into October 2013. In the meantime, #5 is detouring over UP's main line in Wyoming.