The California Zephyr runs through Rocky, Colorado as it heads towards Big Ten Curve while heading into the Moffat Tunnel Sub.

A manifest dips under Highway 93

BNSF 3275 (ES44C4) meets another freight at Rocky, Colorado as it heads west on the Moffat Tunnel Sub.

Cows are being tended to below as the California Zephyr above runs through Big Ten Curve at Rocky, Colorado.

The California Zephyr meets a BNSF freight at Rocky, Colorado as it begins the journey into the Colorado Rocky Mountains.

BNSF 3275 (ES44C4) leads a westbound freight down the grade at Rocky, Colorado, passing another BNSF Freight that is waiting on the siding.

A golden sunrise catches UP 5430 (ES44AC) as it leads a loaded coal train through Little Ten Curve at Rocky, Colorado.

UP 7045 (C44ACM) leads a train through a very frosted Rocky, Colorado.

The Union Pacific relocated their Denver & Rio Grande Western Jordan Spreader DRGW AX-41 from Grandby, Colorado to Denver, with the goal of taking it to Wyoming to help with the heavy snows.

BNSF 7193 (ES44C4) shoves a long freight through Big Ten Curve as it climbs up the Moffat Tunnel sub towards Blue Mountain.

A BNSF freight with 9 motors, including a Canadian Pacific and a KCS Belle, heads into Little Ten Curve as it begins the journey up the Moffat Tunnel Sub.

A nine unit consist pulls a long freight through Big Ten Curve and is heading towards Coal Creek Canyon in Colorado.

Dawn just starts to break with the Denver Skyline in view as UP 5430 (ES44AC) brings a coal train into the siding at Rocky, Colorado.

It looks like BNSF 3784 (ES44C4) is leading the BNSF Provo manifest down a roller coaster ride through Rocky, Colorado.

Here we see the entire stretch between Rocky, Colorado in the upper left and Big Ten Curve in the upper right. BNSF 4327 has just gone through Big Ten and is heading towards Little Ten before tur... (more)