There is a small BNSF yard in Golden, Colorado where you can still find former ATSF cabooses on the active roster.

After running through Big Ten Curve, UP 6049 winds its way towards Denver through Arvada, Colorado. Here we see the mid-train helper engines as they pass beneath Highway 93.

The Big Ten Curve enables UP 6049 (AC44CWCTE) to drop further in altitude, winding through the 270 degree switchback which keeps the grade change at 2%.

From this vantage point you get a good perspective of the grade change as UP 6049 (AC44CWCTE) drops down from Tunnel #1 and heads to the Big Ten Curve.

RTD commuter train #4047 (Hyundai Eagle P3) rounds the corner past the UP 36th Street Yard and will soon arrive at the Rhino Station in north-central Denver.

UPY 618 (GP15-1) holds for a green signal to bring a small freight into a yard in Commerce City.

UP 1370 (former Denver & Rio Grande Western GP40-2) leaves the 36th Street Yard with a string of freight cars.

An Executive MAC, a Pony and a Warbonnet round out the interesting visitors to the BNSF engine servicing yard in Denver.

BNSF 1684 (SD40-2) gets repositioned in the Denver Yard and will soon be shuffling more freight cars.

The Denver Rock Island Railroad's SW1500 makes way for one of the many trucks that use Packinghouse Road in the Stockyards industrial area.

BNSF 8900 runs down Atwood Street in Longmont, Colorado, pulling a freight from Fort Collins. The upside down writing on the jeep windshield says "If you can read this flip me over!"

UP 7107 (AC4400CW) teams up with a couple of pumpkins and gets ready to receive some sand and fuel at the BNSF engine servicing facility in Denver, Colorado.

When the BNSF runs a load of freight to clients in Broomfield, Colorado they will stop at Burns Junction in Westminster and swap an engine from the front to the rear, which then leads the train as... (more)

BNSF 3160 (GP50) pushes back down the Broomfield spur to drop off a load of freight cards. If you look closely you can see an engine on the far end, making for this unique pull me - push you cons... (more)

When's the last time you saw two former Burlington Northern engines and one is pulling a BN caboose?