Long, heavy trains over Sherman Pass often require DPUs to relieve drawbar stress. And sometimes they have DPUs for other reasons ... Caboose 25872 can be seen Railroad: Union Pacific
Locomotive: EMD SD70M
Location: Hermosa, Wyoming, USA
Locomotive #: UP 4563
Train ID: Unknown
Photo Date: December 28, 2008

A northbound departs Macon Siding, heading for CSX's intermodal terminal at Fairburn, GA.