UP 2751 (ES44AC) leads a freight through the aspen trees in the Tolland Valley as it heads east on the Moffat Tunnel Sub.

A Union Pacific freight emerges from a grove of golden aspen trees as it heads east on the Moffat Tunnel Sub.

A Union Pacific freight runs through the Tolland Valley on a beautiful fall day in the Colorado Rockies.

Tolland Schoolhouse One of several oil trains each day running on the Moffat Road

Crude Oil Morning sun plays nicely in the valley for this capture

Morning Crude in Boulder Park Eastbound crude oil is working past Tolland in Boulder Park.

UP 2751 (ES44AC) runs through the Tolland Valley as it heads east on the Moffat Tunnel Sub which will lead to Denver, Colorado.

UP 2751 (ES44AC) has just emerged from the Moffat Tunnel and heads towards the Tolland Valley as it runs eastbound on the Moffat Tunnel Sub.

UP 2751 (C45AH) runs through Tolland, Colorado at the height of the changing of the aspen, which have turned the valley into gold.

UP 2751 (C45AH) leads an eastbound freight down the mountain on the Moffat Tunnel Sub, running between Tolland and Rollinsville.

UP 2751 (C45AH) leads an eastbound freight down the Tolland Valley, passing the historic green schoolhouse that sits in the valley painted gold with the changing aspen.

UP 2751 rips through Terrell hitting track speed with ZLAME at first light

Way Back Machine: Before the oddball models were disposed from UP's roster, a veteran SP SD45 rebuild hustles a Northbound freight through Dupo on a foggy spring morning. This unit started ... (more)

UP 2751, 3830, & 8471 with westbound stacks.

Yarding a train