BNSF 3171 (GP50) runs light to Broomfield, Colorado as it has finished dropping cars off with customers in Lafeyette.

BNSF 3171 (GP50) heads to the house track in Longmont, Colorado where the pair will tie down for the day.

Cars on US 287 hold as BNSF 3171 (GP50) leads the Buck Local as it runs light back to Broomfield, Colorado.

BNSF 3171 (GP50) leads the Buck Local as it heads back to Broomfield, Colorado.

BNSF 3171 (GP50) get ready to cross a busy highway as it heads back to Broomfield, Colorado.

Two former AT&SF motors, including a former GP25 Bluebonnet and B40-8W Warbonnet, sit in the yard in Longmont, Colorado.

A pair of BNSF motors make a light run towards customers in Lafeyette, Colorado on the Front Range Sub.

BNSF 3171 (GP25) passes apartments as it runs south on the Front Range Sub through Broomfield, Colorado.

BNSF 3171 (GP25) runs light with a made on the branch line from the Broomfield Siding and will pick up cars from customers in Lafeyette, Colorado.

BNSF 3171 (GP50) runs light as it rounds the corner of Burkes Hill in Louisville, Colorado.

BNSF 3171 (GP50) sorts a cut of cars from the yard in downtown Denver, Colorado.

BNSF 3171 (GP50) works a cut of cars in the large yard in Denver, Colorado.

BNSF 3171 (Ex AT&SF GP50) works a cut of cars in the BNSF yard in downtown Denver, Colorado.

BNSF 3171 (GP25) and mate run light in the terminal at Hudson, Colorado.

BNSF 3171 (GP25) moves a cut of oil cans in the yard in Hudson, Colorado.