A visiting pony from the east coast waits for service in the BNSF engine servicing facility in Denver, Colorado.

NS 4021 (AC44C6M) waits for service as the California Zephyr 5 train backs into Denver's Union Station.

The lead locomotive has excessive smoke coming from the exhaust and snow from New Jersey on the front end. NS 4021 was originally built as NS D9-40C 8823 in 1995.

A second empty coal train lugs its way up Christiansburg Mountain about 1 hour after NS #8152 and #4074. This one lead by NS #4021 and #7634 is caught on the porch of the classic farm house at the... (more)