UP 3985 Challenger [OC]

At the time of this photo, Union Pacific 3985, a Challenger class 4-6-6-4, was the largest operating steam locomotive in existence. This locomotive was donated by Union Pacific to a museum and has been replaced in excursion service by an even larger 4-8-8-4 Big Boy locomotive.

Photographed in September 2005 at the UP Albina Yard. Portland, Oregon.