The view from the rear helper on a westbound grain train, the head end is about to enter tunnel 1.

Amtrak’s westbound California Zephyr curves through a cut at milepost 23 on the approach to Tunnel 1 just east of Plainview, Colorado, on January 4, 2019.

A light breeze adds to the already cool and crisp air as BNSF ES44AC No. 6285 leads the Provo-Denver manifest through the tunnel district near Plainview, Colorado, on January 19, 2019.

On a cold and snowy Saturday afternoon, BNSF’s Provo, UT to Lincoln, NE manifest emerges from Tunnel 4 next to the Flatirons of the Rocky Mountains on January 12th, 2019.

Amtrak’s westbound California Zephyr curves toward Tunnel 1 just east of Plainview, Colorado, on the morning of January 4, 2019.

On a warm January 4, 2019, day in Colorado, a westbound BNSF unit oil train powered by a pair of EMD SD70ACes, climbs the grade toward Tunnel 1 at Plainview.

An eastbound Union Pacific coal train descends a 2 percent grade on the Front Range of the Rockies through the unique Flatirons rock formations just west of Plainview, Colorado, on February 28, 20... (more)

An early season snowstorm has blanketed Colorado’s front range mountains with winter white on November 30, 2006, as an eastbound Union Pacific coal train drops downgrade out of Plainview and is ... (more)

Six Burlington Northern/BNSF EMD SD70MACs power a westbound coal train around the horseshoe curve at mouth of Coal Creek Canyon between Clay and Plainview, Colorado, on October 3, 2001.

Amtrak’s westbound California Zephyr climbs toward Tunnel 1 just east of Plainview, Colorado, on January 14, 2006.

On the morning of January 14, 2006, the westbound Rio Grande Ski Train approaches Tunnel 1 just east of Plainview, Colorado.

Amtrak No. 5 heads west out of Plainview, Colorado, just after exiting Tunnel 2 on the morning of May 14, 2017. The large fill the train is crossing over Bull Gulch was totally washed out by a hea... (more)

A summer version of the Rio Grande Ski Train curves out of Plain and is about to enter the final tunnel for the day—Tunnel 1—on July 28, 2001. Operated in the warmer months for hikers and moun... (more)

Chicago & North Western GE C44-9W No. 8625 leads a westbound Union Pacific manifest freight approaching Tunnel 1 east of Plainview, Colorado, on May 2, 1998.

An eastbound Union Pacific coal train powered by Southern Pacific GE AC4400CWs threads Tunnels 2 and 3 just west of Plainview, Colorado, on March 20, 1997. The unique Flatiron rock formations domi... (more)