Stacks of welded rail for Denver's new East Rail Line to DIA sit covered in snow as a loaded UP coal train trudges slowly eastward.

The rear of an empty coal train hangs over top of the hill at the west end of Mesa on a warm May evening.

Scattered showers just minutes earlier have given way to bright summer sunshine and a brilliant rainbow over the plains east of Denver.

Rounding the curve heading east out of the bustling metropolis of Pinecliffe, a BNSF manifest makes its way toward Denver on a bluebird Colorado day.

Six inches of fresh snow has every pine tree and boulder glistening in the bright Colorado sunshine on a perfect March morning. Down below an eastbound UP freight rounds a curve near Pinecliffe on... (more)

Bright sunshine, a stunning blue sky, and several inches of fresh snow cover the pine forests along the Moffat Route near Crescent. Even absent a train, the quiet scene illustrates the beauty of R... (more)

Amtrak's eastbound California Zephyr cruises through scenic Glenwood Canyon after an on-time departure from nearby Glenwood Springs on a beautiful January afternoon.

Hugging the cliffs along the Colorado River, a BNSF manifest passes the tiny settlement of No Name in the heart of Glenwood Canyon.

The shadowy confines of Glenwood Canyon still hold plenty of snow as a BNSF manifest rolls westbound near Grizzly on this "bluebird" January afternoon.

The afternoon Royal Gorge Route passenger train is about to pass through the heart of the Royal Gorge, some 900 feet below the famous suspension bridge at Royal Gorge Park.

Colorado's colorful autumn is stretching well beyond its normal peak this year as evidenced by the brilliant foliage still on display in mid-October near Steamboat Springs. This coal empty is wait... (more)

A loaded UP coal train travels through the hills of northwest Colorado, the landscape blanketed with reds and oranges of late fall. In the distance to the north, the well-known slopes of Steamboat... (more)

On a dark and gloomy morning, unusual in Colorado's high country, a UP coal train is negotiating the first curves of Byers Canyon alongside the Colorado River.

Exiting Byers Canyon into a brief shot of sun, the UP SD70ACe once again picks up speed for the eastbound run to Winter Park where it will enter the Moffatt Tunnel across the continental divide.

A trio of BNSF units lead a mixed freight along the Colorado River's winding course through Byers Canyon.