An eastbound BNSF freight fills Big 10 Curve between Eisele and Rocky, Colorado, on the warm afternoon of February 9, 2015. The 76-car train is made up of mostly tank cars—73 to be exact.

An eastbound BNSF manifest freight encircles Big 10 Curve between Eisele (Clay) and Rocky, Colorado, on February 14, 2015.

Big 10 Belles: Two Kansas City Southern EMD SD70ACes power a westbound Union Pacific oil train around Big 10 Curve west of Rocky, Colorado, on a beautiful 64° February 13, 2016. The 73-car train b... (more)

An eastbound Union Pacific coal load drops downgrade through Eisele (formerly Clay), Colorado, on August 11, 2015. Three levels of track can be seen from this location near Big 10 Curve. The train... (more)

A Union Pacific XCLX (Xcel Energy) coal train passes through Eisele (formerly Clay), Colorado, on the afternoon of June 9, 2013. Waiting for the eastbound is a coal empty sitting at Rocky siding d... (more)

Amtrak’s eastbound “Winter Park Express” ski train passes over a fill approaching Big 10 Curve just east of Eisele (Clay), Colorado, on March 15, 2015. In a couple of minutes, the train will be tr... (more)

Elk graze on vegetation in the open space as the westbound Ski Train led by Amtrak's "Veterans Unit" no. 42 rolls right on through Eisele heading west to the ski resort in Winter Park.

An eastbound Union Pacific coal train traverses Big 10 Curve at Eisele (formerly Clay), Colorado, on February 14, 2015. The head end of the train is already out of sight on the left and approachin... (more)

An eastbound Union Pacific coal train more than fills Big 10 Curve between Eisele (formerly Clay) and Rocky, Colorado, on a warm Valentines Day 2015. A pair of GE ES44ACs are on the head end (UP N... (more)

As the head end of an eastbound Union Pacific coal train traverses Big 10 Curve in the background, the mid-train DPUs leave Eisele (formerly Clay) in the foreground. Two other tracks can also be s... (more)

Lotsa eights: Union Pacific coal load CEYPS curves past milepost 22 just west of Eisele (Clay), Colorado, early in the morning of February 9, 2015. UP No. 8888 built in 2014, is a “heavier than no... (more)

Union Pacific coal load CEYPS curves past milepost 22 just west of Eisele (Clay), Colorado, early in the morning of February 9, 2015. UP No. 8888, built in 2014, is a heavy EMD SD70ACe that UP lab... (more)

It was 68° in Denver/Arvada, Colorado, on February 9, 2015, so a friend and I decided to hike out to Big 10 Curve to take advantage of the sunny skies and warm weather. This slightly different ang... (more)

Union Pacific’s Denver to Salt Lake City manifest freight About to pass over Blue Mountain Drive grade crossing west of Eisele (Clay), Colorado is Union Pacific MNYRO on February 2, 2014. Four GE ... (more)

An eastbound Union Pacific coal train snakes through Big 10 Curve on the afternoon of June 9, 2013. In the foreground are two AC4400CWs being used as rear DPUs going through Eisele (formerly Clay)... (more)