A pair of Executive Grinstein SD70MAC's head south towards Fort Collins, Colorado on the Front Range Sub, having left Cheyenne, Wyoming in the morning.

A pair of Executive Grinstein SD70MACs cross the bridge at Owl Canyon with a freight destined for Fort Collins, Colorado.

Here is a close up of the 25th Anniversary engines #6075 (ES44AC), showing the stickers applied to acknowledge the heritage flags of the BNSF.

One of BNSF's 25th Anniversary engines #6075 (ES44AC) runs over the bridge at Owl Canyon, Colorado.

A northbound BNSF empty ballast train led by a trio of GE's enters a hole of sunshine as the train trundles through the open prairie near Owl Canyon, Colorado on April 9, 2018.

In the vast open spaces north of Fort Collins off of the Interstate 25 exit at Buckeye Road, a northbound BNSF empty ballast train trundles north near Owl Canyon, Colorado on April 9, 2018.

Clouds and some storms build up over the mountains at the Denver, Colorado to Casper, Wyoming manifest rolls north near Owl Canyon with BNSF C44-9W No. 730 leading on June 09, 2015.

It's a gorgeous morning as BNSF ES44AC No. 5795 leads an eight car OCS train around the sweeping curve near Owl Canyon just north of Wellington, Colo., on June 02, 2015.