Denver and Rio Grande Western GP40 No. 3083 is the east unit on a helper set at Minturn, Colorado, in July 1984. Behind No. 3083 is a GP40-2, a SD40T-2, a SD45, and two more SD40T-2s. One track over in front of Minturn’s small enginehouse is GP35 No. 3043. These large helper sets were used on the steep 3-percent eastward grade up Tennessee Pass out of the crew change town of Minturn.