BNSF 8755 (SD70ACe) leads a colorful consist of heritage power through Hudson, Colorado on the Brush Sub.

BNSF 2857 (GP39-2) sits among other light power at the servicing facility in Denver, Colorado.

Hudson Terminal Railroad's veteran # 646 (Alco S1) runs through the yard next to vintage passenger cars which are stored at the terminal.

The Winter Park Express Ski Train leaves Denver's Union Station and runs through the numerous catenaries that support Denver's RTD Commuter Rail train system.

Light snow falls as the Amtrak Winter Park Express Ski Train heads to the Moffat Tunnel in Tolland, Colorado.

Amtrak engine #163 (P42DC) leads the California Zephyr through Tolland, Colorado on its way to the Moffat Tunnel.

This view offers a good look at the detailed painting of the new Phase VII paint scheme for Amtrak engine #174 (P42DC).

Amtrak’s eastbound California Zephyr passes the Winter Park Express ski train tied down in the siding at Fraser, Colorado, on January 11, 2019.

Amtrak engine #174 in the new Phase VII paint brings the California Zephyr through the BNSF yard in Denver, Colorado.

After arriving in Denver on the front of the California Zephyr, Amtrak engine #174 gets positioned in the Denver Yard until the Winter Park Express Ski Train returns from its run to the ski resort... (more)

One of Amtrak's newest painted P42DC (#174) led the California Zephyr from Chicago to Denver, where the colorful unit will be pulled off and assigned to the Winter Park Express Ski Train.

UP 2537 (ES44AC) leads a power move south on the Greeley Sub through Plattville, Colorado.

BNSF 5919 (ES44AC) leads the Provo to Denver train past Rollinsville, Colorado on the Moffat Tunnel Sub.

The California Zephyr 5 train runs underneath the bridge at the Glenwood Springs Depot.

The California Zephyr leaves the Glenwood Springs Depot and will run west towards the next station at Grand Junction, Colorado.