UP 6937 leads a westbound Z between Dome and Kinter.

UP 6937 is the first in a long line of stored DD40Xs in the Las Vegas yard. It hard to believe I took this photo 39 years ago. Photo taken with permission.

Union Pacific Centennial 6937 is the last in a long line of stored DD40X locomotives, followed by a long line of GP-30B units. The dry California desert air made for a good location to store many... (more)

UP 6937 is the first in a long line of stored DD40Xs in the Las Vegas yard. Photo taken with permission.

Hermosa WY Oct 19 1977 -- DDA40X 6937 leads an eastbound mixed freight on Sherman Hill. The train is crossing over a former UP alignment.

Westbound UP intermodal Summit

Westbound UP Bartolo Jct Pico Rivera

A Union Pacific grain shuttle departs Salt Lake City for a trip west on former WP rails to Northern California. The UP 6937 was built the UP 7549 in January 1999 as a 6000 horsepower C60AC. It wou... (more)

Union Pacific DDA40Xs 6937 and 6921, along with a GP30B, take an eastbound manifest over Cajon Pass on a snowy December 30, 1974.

Under a morning marine layer on the west side of Cajon Pass, two Centennials and an SDP35 have command of one of the railroad's hottest trains--the LAX.

6937 West, a short freight for a pair of DDA40Xs, roars upgrade through Frost.