BNSF 1579 (SD40-2) and mate run light into the refinery district in Commerce City, Colorado.

BNSF 1579 (SD40-2) runs light with a mate as it heads to a refinery in Commerce City, Colorado.

BNSF 1579 (SD40-2) peaks out of the shadows as it waits for servicing at the engine facility in downtown Denver, Colorado.

BNSF 1579 (SD40-2) peaks out of the shadows at the engine servicing facility in Denver, Colorado.

BNSF 1579 (SD40-2) sits on the time out track at the BNSF engine servicing facility in Denver, Colorado.

BNSFs Golden local rolls past the Colorado Railroad museum just outside of Golden Colorado.

The yard crew catches a ride on BNSF 1579 (SD40-2) as it pulls another cut of cars which will be assembled for a freight headed to Denver.

BNSF 1579 (SD40-2) takes a freight to the BNSF yard in Golden, Colorado.

BNSF 1579 (SD40-2) passes through Arvada with a freight destined for Golden, Colorado.

BNSF 1579 (SD40-2) scoots past one of the few remaining AT&SF painted cabooses still on the active roster.