On Colorado’s Front Range on the afternoon of April 30, 2001, Union Pacific’s MDVRO (Denver to Roper Yard in Salt Lake City) manifest freight heads into Clay siding for a meet with Amtrak No. 6. Rio Grande EMD SD40T-2 No. 5413 leads the big locomotive consist, and is followed by a UP SD40-2, three UP GE AC4400CWs and three Southern Pacific AC4400CWs.