The engineer of BNSF 2897 (GP39M) gives a wave as he heads up the 2-percent grade to the top of Burkes Hill near Louisville, Colorado.

BNSF 6195 (ES44AC) leads a freight through the turns in Louisville, Colorado.

BNSF 2549 (GP39-3) leads a freight up the hill from Boulder to Louisville, Colorado.

It is just after sunset as BNSF ES44C4 No. 6764 leads a southbound manifest up the 2-percent grade to the top of Burkes Hill near Louisville, Colorado, on November 18, 2018.

BNSF 3160 (GP50) runs through Louisville on the way to Broomfield, Colorado.

BNSF 2549 (former AT&SF Bluebonnet GP39-3) runs a small freight through Louisville, Colorado.

BNSF 3020 (GP40M) leads a load of lumber through Louisville, Colorado.

BNSF 5874 (ES44DC) leads a long line of empty Department of Defense flat cars through the 'S' curves in Louisville, Colorado.

With a few minutes left before sunset, BNSF B40-8 No. 573 and GP39-3 No. 2598 lead the "Buck Local" north approaching Dillon Road in Louisville, Colorado on March 19, 2018.

BNSF 7146 leads a triple header double stack as snakes through the 'S' curves in Louisville, Colorado.

Warbonnet 517 passes the Valmont Power Plant in Boulder, Colorado.

Warbonnet 517 leads a short freight through the 'S' curves in Louisville, Colorado.

Although there is cloud cover, temperatures were still in the mid to upper 80's as BNSF ES44C4 No. 6849 leads the Denver-Seattle stack train north over Coal Creek in Louisville, Colorado on June 8... (more)

A storm system dumps snow up in the mountains in the background while Kansas City Southern ES44AC No. 4863 leads an empty BNSF sand train up the 2-percent grade to the top of Burkes Hill near Lafa... (more)

An Arctic airmass is still settled in along the Front Range, with the temperature around -10F. It is just after sunrise as BNSF C44-9W No. 1011 leads the Cheyenne, Wyoming to Denver, Colorado mani... (more)