Union Pacific Big Boy engine #4014 leaves Denver under a heavy blizzard of snow and an impressive amount of steam.

BNSF 6286 (ES44AC) runs under the Park Avenue Viaduct in Denver, Colorado as it heads to the Denver Yard and a waiting train.

The cows seem more interested in the photographer than BNSF 5807 (ES44AC) which leads a train north on the Joint Line through Roggen, Colorado.

A fresh-looking BNSF 3320 (ES44ACH) leads a coal train under stormy skies south on the Joint Line through Castle Rock, Colorado.

BNSF 5097 (Dash9) leads a freight through the S curve at Castle Rock, Colorado

RTD commuter train #4032 runs towards Arvada, Colorado at sunrise.

BNSF 8554 (SD70ACe) leads a power-heavy consist as it heads towards the Moffat Tunnel Sub with a long string of oil cans.

After dropping off the cut of freight cars in the yard in Longmont, Colorado, BNSF 9709 (SD70MAC) leads a fellow MAC back to the depot to tie down for the day.

Having been built in February of 1975 for the Atchison Topeka and Santa Fe Railroad, it's amazing that after 50 years it still wears the Bluebonnet paint scheme.

UP 1905 (SD40N) heads into the North Yard in Denver, Colorado for a stint of shuffling freight cars.

UP 8062 (ES44AC) leads a freight through Eaton, Colorado as it heads to Denver on the Greeley Sub.

BNSF 1448 (SD60M) leaves the Denver Yard with a short freight.

The California Zephyr runs through Plainview, Colorado as it heads into the Rocky Mountains on the Moffat Tunnel Sub.

A former Cascade Green Burlington Northern GP39-2 works the Buck Local and is based in Longmont, Colorado.

There are not many Executive MAC's left that can lead a train , and BNSF 9709 can be found working the Switch between Longmont and Fort Collins, Colorado.