RTD commuter rail train 4030 (Hyndai Eagle P3) heads out of Union Station as the passenger cars on the UP Big Boy special back into downtown.

RTD 4031 (Hyundai Eagle P3) runs past the Union Pacific's North Yard in Denver, Colorado.

RTD 4047 (Hyundai Eagle P3) runs at Denver's Union Station, past Amtrak's 'Bumblebee 203', which carries the colorful Operation Lifesaver 50th Anniversary markings.

With a massive thunderstorm cell looming in the background, RTD 4030 (Hyundai Eagle) runs on the commuter rail line linking Denver International Airport with downtown Denver.

RTD 4033 passes an old water tower as it runs the elevated track along the Union Pacific's North Yard in Denver, Colorado.

RTD commuter train 4026 (Hyundai Eagle P3) runs on the elevated section of track past the UP's North Yard at dawn.

Two RTD commuter trains are in the Denver Union Station and will soon take passengers to the four corners of the Denver Metro Area.

RTD Commuter Train 4026 (Hyundai Eagle P3) runs past a dynamic sunrise as it heads towards Arvada, Colorado.

Commuter RTD train 4022 runs over the North Yard track as it heads towards Arvada, Colorado.

RTD 4034 (Hyundai Eagle P3) runs through the Union Pacific's North Yard on the elevated track at sunrise.

RTD Commuter Train 4040 (Hyundai Eagle P3) leaves Denver and heads towards Arvada, Colorado.

RTD 4065 (Hyundai Eagle P3) gives passengers a good view of the BNSF engine servicing facility and the special firefighting tank cars which await the fire season.

R in the Road. An RTD R Line train bound for Lincoln is seen curving onto E Ellsworth Ave from private right-of-way between 2nd Ave & Abilene and Aurora Metro Center Stations.

RTD 4033 (Hyundai Eagle P3) runs past a water tower at sunrise, no doubt delighting the passengers with the view.

RTD Commuter Train 4030 (Hyundai Eagle P3) gets ready to pull into the terminal at Denver International Airport.