Amtrak's eastbound California Zephyr, train #6, descends down the eastern slope of the Colorado Rockies around Big Ten Curve as it nears Denver, CO. Here, this already late train will come to a st... (more)

Here we see the California Zephyr rounding Big Ten Curve. Big Ten is a series of long curved sections of track ('Little Ten' is 90 degrees and the largest, 'Big Ten', is 270 degrees) with a track ... (more)

The California Zephyr rounds the corner at Big Ten Curve as it drops down from the foothills and heads to Denver's Union Station.

AMTK 152 (P42DC) leads the California Zephyr through Big Ten Curve which will help the train climb the steep grade towards Tunnel #1.

The ski train gets an early start as it heads up the Moffat Tunnel Sub, passing through Little Ten Curve, which will soon be followed by Big Ten Curve and then 28 tunnels on its way towards the Wi... (more)

With the City of Denver skyline visible in the background, Amtrak 172 leads the California Zephyr around Big Ten Curve, passing a wind-break consisting of a string of former coal cars filled with ... (more)

The California Zephyr climbs the hill behind a BNSF freight that was holding on the Rocky siding and is now heading to Denver.

The California Zephyr led by AMTK 45 (P42DC) meets a BNSF freight which has taken the siding at Rocky, Colorado. The waiving crew member of BNSF 6103 performs a roll-by check of the passenger tra... (more)

An eastbound Burlington Northern Santa Fe manifest freight drops downgrade off Big 10 Curve approaching Rocky, Colorado, on the afternoon of April 13, 2002.

An eastbound Burlington Northern Santa Fe manifest freight train, led by Santa Fe warbonnet GE C44-9W No. 627, brings a train out out of the siding at Rocky, Colorado, on the morning of June 24, 2... (more)

There’s a traffic jam of freight trains at Rocky, Colorado, on the morning of June 24, 2000. Union Pacific’s MDVGJX, an extra Denver to Grand Junction train, holds the main line at Rocky. On t... (more)

Nine BNSF GE locomotives (the ninth is on the rear of the train as a single DPU) are on an eastbound BNSF manifest freight train approaching Rocky, Colorado, on the afternoon of July 22, 2006.

Led by Southern Pacific GE AC4400CW No. 340, an eastbound Union Pacific coal train descends the two percent grade between Clay and Rocky, Colorado on April 13, 2002. The head en is approaching the... (more)

Powered by a pair of Rio Grande EMD GP40-2s, Union Pacific’s West Local switches the aggregates plant at the end of Rocky Spur leaving the main line at Rocky, Colorado, on February 21, 2002.

Climbing toward Big 10 Curve between Rocky and Clay, Colorado, is the Rio Grande Ski Train on the morning of March 3, 2006.