The KMNOA, a westbound stack train from Marion, Arkansas to Oakland, California, had suffered an engine failure in Tunnel 41, the Donner Summit tunnel. It drifted back until its lead units were out of Tunnel 41 and the crew and the mechanical department futzed around for a while trying to get the 8523 running again.
Several of us, who were camped at Eder at the east end of the tunnel, headed to Shed 47 to watch the show if the K train had to back further. Here is its DPU above Donner lake with the patch of snow on Mt. Judah in the background.