A very frosty BNSF 8348 (ES44C4) runs through Acequia, Colorado on the Join Line as heavy snow falls over the Front Range.

BNSF DPU 9029 (SD70ACe) shoves a loaded coal train through Hudson, Colorado.

The California Zephyr 6 train runs down from Tunnel #1 at Plainview, Colorado.

The California Zephyr runs through Plainview, Colorado on a beautiful morning in the Colorado Rocky Mountains.

Amtrak engine #204 (P42DC) leads the California Zephyr into the Keenesburg Cut at sunrise.

UP 7104 (AC4400CW) exits Tunnel #1 at Plainview, Colorado with a crewman on the front deck.

BNSF 7853 (ES44DC) leads a freight through Castle Rock, Colorado on the Joint Line.

PRLX 4102 (SD40-2) and another unit work the intermodel facility in Hudson, Colorado.

The 78-year-old Alco S1 still makes bank for the Hudson Terminal Railroad as it works the yard in Hudson, Colorado.

The Alco S1 which operates for the Hudson Terminal Railroad moves a cut of oil cans to a ready track for pickup by the BNSF.

The California Zephyr runs through Keenesburg, Colorado just as the sun peeks over the horizon.

The California Zephyr runs through a frosty Coal Creek Canyon as it begins the climb into the Colorado Rocky Mountains.

BNSF 5751 (ES44AC) leads a freight through Tolland, Colorado after exiting the Moffat Tunnel.

BNSF 5919 (ES44AC) muscles a freight down the grade from Tunnel #1 into Coal Creek Canyon, Colorado.

BNSF 7995 (ES44C4) sits with light power at the engine servicing facility in Denver, Colorado.