After coming down from the Moffat Line and dropping into the Big Ten Curve bowl, BNSF 7651 (ES44DC) will complete the 270 degree radius and head to Denver.

BNSF 7651 (ES44DC) leads a freight down into the bowl known as Big Ten Curve. The drop in grade is notable as the train will wind its way down through a 270 degree radius.

Union Pacific’s Roper Yard in Salt Lake City to North Yard in Denver manifest freight curves through Rocky, Colorado, on a snowy April 23, 2001.

A pair of Grinstein-painted EMD SD70MAC manned helpers pushes on a westbound Burlington Northern Santa Fe freight out of Rocky, Colorado, on Union Pacific’s former Rio Grande Moffat Tunnel route... (more)

ex SP now UP 6334 leads an eastbound coal load at Rocky, CO, on the UP Moffat Sub, Jan 10, 2004.

Amtrak’s westbound California Zephyr climbs out of rocky, Colorado, towards Big 10 Curve on August 21, 2019. At this late date, I was surprised to see a somewhat tired-looking GE P40DC No. 817 l... (more)

A momentary spotlight of sunshine illuminates the head end power of an eastbound Union Pacific coal train at Rocky, Colorado, on an otherwise stormy afternoon of June 2, 2007.

DRGW 3014 and 3003 with caboose 01487 at Rocky, CO, Dec 10, 1983.

On August 21, 2019, Union Pacific No. 1943 leads a westbound passenger train (office car special) on the railroad’s former Rio Grande Moffat Tunnel route west of Rocky, Colorado. By evening, the... (more)

Electro-Motive Division SD90MAC-H demonstrator locomotive No. 8504 heads west on Union Pacific’s former Rio Grande main line at Rocky, Colorado, for some high-altitude testing on February 3, 199... (more)

A long Union Pacific train of covered hoppers negotiates the curves at Rocky, Colorado, with EMD SD70ACe No. 8933 as rear DPU on the eastbound train on June 21, 2018.

DRGW 5771 leads westbound Train #117 at Rocky, CO, Mar 11, 1979.

DRGW 3116 with the westbound Ski Train at Rock, CO, on Mar 11, 1978.

Four GE products lead a mixed freight down the 2% grade to Denver on a sunny December morning. The snow on the plow gives a hint to the conditions at higher elevations, as the sun down here, doesn... (more)

AMTK 133 leads the California Zephyr through the evergreens of Plainview, Colorado.