As billowy clouds move quickly across the sky, BNSF 5831 (ES44AC) leads a loaded coal train south on the Joint Line through Castle Rock, Colorado.

BNSF 5831 (ES44AC) passes a cow as it heads south on the Joint Line with a loaded coal train.

BNSF 5831 (ES44AC) runs through Castle Rock, Colorado on its way to Colorado Springs on the Joint Line.

BNSF 5831 (ES44AC) leads a loaded coal train south on the Joint Line through Castle Rock, Colorado.

Storm clouds move over the namesake rock formation in Castle Rock, Colorado as BNSF 5831 (ES44AC) heads south on the Joint Line.

BNSF 5831 (ES44AC) leads a loaded coal train past the Three Oaks Ranch in Castle Rock, Colorado as it heads south on the Joint Line.

BNSF 5606 (AC4400CW) runs south on the Joint Line through Castle Rock, Colorado as the setting sun shines the last minutes of sun on the motor.

The large rock formation that gives Castle Rock, Colorado its name, looms in the background as BNSF 8390 (ES44C4) leads a loaded coal train south on the Joint Line at sunset.

BNSF 5606 (AC4400CW) crosses over a bridge in Castle Rock, Colorado as the sun gets ready to set behind the Colorado Rocky Mountains.

BNSF 5606 (AC4400CW) runs through Castle Rock, Colorado as a thunderstorm develops to the east.

The last minutes of setting sun shines on BNSF 5606 (AC4400CW) as it leads a coal train south on the Joint Line at Castle Rock, Colorado.

Here is a good look at the Siemens ALC-42 cab car on the end of the new Amtrak Siemens Airo Cascades train being ferried to Pueblo, Colorado for testing.

Amtrak's special train runs south on the Joint Line between Sedalia and Castle Rock, Colorado, taking the newest Siemens Airo Cascades train to Pueblo for testing.

BNSF 5340 (Dash9) leads a loaded coal train towards Castle Rock Colorado as it runs south on the Joint Line.

UP 7504 (ES44AC) leads a freight north on the Joint Line through Castle Rock, Colorado.