BNSF 2857 (GP39-2) runs through past apartments in Broomfield, Colorado.

BNSF 2857 (GP39-2) runs through Boulder, Colorado on the way to Louisville.

BNSF 2857 (GP39-2) passes the Denver to Laurel Montana on the Front Range Sub in Broomfield, Colorado.

BNSF 2857 (GP39-2) meets the Denver to Laurel Montana on the Front Range Sub in Broomfield, Colorado.

BNSF 2857 (GP39-2) heads south on the Front Range Sub and will soon arrive in Boulder, Colorado on its way to Lafeyette.

BNSF 2857 (GP39-2) leads the Buck Local out of Longmont, Colorado on the Front Range Sub.

The Buck Local runs in a push me - pull you configuration as it heads towards a dead-end siding in Lafeyette, Colorado.

BNSF 2857 (GP39-2) rounds a corner in Broomfield, Colorado as it heads south on the Front Range Sub.

BNSF 2857 (GP39-2) leads the Buck Local through Burke's Hill in Louisville, Colorado on the Front Range Sub.

BNSF 2857 (GP39-2) leads the Buck Local past some farmland in Louisville, Colorado.

BNSF 2857 (GP39-2) tops Burkes Hill in Louisville, Colorado as it heads south on the Front Range Sub.

BNSF 2857 (GP39-2) runs through a tree canopy in Boulder, Colorado on the Front Range Sub.

The Jasper Local has just left Carbon Hill headed back east towards Jasper, Al

BNSF 2857 (GP39-2) leaves Longmont, Colorado as it heads south on the Front Range Sub.

BNSF 2857 (GP39-2) runs through Boulder, Colorado as it heads south on the Front Range Sub.