The morning California Zephyr train leaves Arvada behind as it winds through Big Ten Curve and heads towards the Colorado Rocky Mountains.

The Colorado Ski Train is once again in operation for the 2020 season. Here we see Amtrak 175 leaving the Denver skyline behind at dawn as it climbs through Big Ten Curve. The train shuttles rider... (more)

The California Zephyr, complete with two baggage cars, climbs the grade to Tunnel #1 on the Moffat Line.

Heavy snow is falling as UP 8986 (SD70ACe) strains to pull a loaded coal train up the hill at Rocky, Colorado.

Clouds roll off the front range mountains of Colorado as a westbound Union Pacific coal empty heads west on the Moffat Tunnel Subdivision west of Rocky on September 27, 2019.

Amtrak’s westbound California Zephyr climbs toward Big 10 Curve west of Rocky, Colorado, on September 27, 2019.

The West Local powered by Rio Grande GP30 Nos. 3002 and 3006 travels Rocky Spur above an eastbound coal train led by Southern Pacific GE AC4400CW No. 267, that is tied down in Rocky siding, on Feb... (more)

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.