A pair of light and heavy units get ready to head into the Yard in Denver, Colorado.
A BNSF coal empty races eastbound along the Yellowstone River just east of Elton, Montana, on the morning of June 15, 2014.
Loaded grain train departs Duluth for Corpus Christi.
A light helper set returns for another push past others waiting for assignment.
A DPU brings up the rear of an eastbound loaded iron ore train as it crosses the Iowa Interstate at Colona.
Pushers shove another load of coal over BNSF's Crawford Hill.
Crawford Hill helpers on the move.
