Old Rio Grande triple hoppers still line the inside of Big 10 Curve west of Rocky, Colorado, as seen on June 9, 2014. Twenty-four of these hoppers are filled with dirt and rocks and are welded to ... (more)

A visiting NS engine gets to tour the Moffat Tunnel line as this Eastbound train takes the siding at Rocky. The mainline is seen on the hillside in the background at the siding of Eisele.

Amtrak’s “Winter Park Express” ski train is passing milepost 19 at West Rocky, Colorado, on the afternoon of March 15, 2015. The eastbound train is led with specially-painted “America’s ... (more)

Union Pacific’s West Local, powered by three Rio Grande GP40-2s, waits on the grade of Rocky Spur for a westbound UP coal empty to pass on the main line at Rocky, Colorado, on February 9, 2002. ... (more)

An eastbound Union Pacific coal load, led by two EMD SD9043MACs, negotiates Little 10 Curve at Rocky, Colorado, on June 18, 2001.

A westbound Burlington Northern Santa Fe ballast train departs Rocky, Colorado, on April 28, 2002. On the point of the heavy train is a trio of SD70MACs, assisted by a pair of SD40-2 manned helper... (more)

Amtrak No. 5, the westbound California Zephyr, approaches Big 10 Curve west of Rocky, Colorado, on a sunny February 9, 2015.

Amtrak’s “Winter Park Express” ski train arcs westbound around Big 10 Curve west of Rocky, Colorado, just after sunrise on March 14, 2015.

AMTK 93 leads a seven car train (sans baggage car) into the Big 10 Curve, where the track nearly loops back on itself to help trains climb the two percent grade up the front range. The track in th... (more)

The regular morning Amtrak left Denver's Union Station about 2 hours after the Ski Train. AMTK 93 is going through 'Little 10 Curve', and will soon be hitting 'Big 10 Curve' on its way to the Moff... (more)

The Saturday morning Amtrak ski train has passed a waiting UP oil can train positioned on the siding at the base of Big 10 Curve. The skin train will stop at Winter Park, Colorado and then bring ... (more)

Lookout Mountain can be seen in the background as Amtrak no 6, The California Zephyr, eases down the grade from Big Ten Curve towards Rocky. The third unit is a brand new Siemens ACS-64 electric l... (more)

Amtrak No. 5 leaves Rocky, Colorado, on clear blocks, even though Union Pacific MNYRO climbs through Tunnel 1 in the background ahead of the passenger train. Amtrak is approaching milepost 19 and ... (more)

Eight locomotives are leading Union Pacific MNYRO west, but not all of them are online, approaching Big 10 Curve west of Rocky, Colorado, on February 9, 2015.

Union Pacific MRONY (Roper Yard to North Yard, Denver manifest) freight nicely fills Big 10 Curve approaching Rocky, Colorado, on a beautiful Valentine’s Day 2015 afternoon. Seven locomotives ar... (more)