Thunderstorms have just moved through the North Yard in Denver, Colorado as UP 1212 (GP39-2) works on a cut of cars.

UP 1997 (SD40N) moves through the North Yard in Denver, Colorado.

UP 1997 (SD40N) reflects off a puddle in the North Yard in Denver, Colorado.

UP GP40X and Amtrak 321 and 322 depart Denver Union Terminal with the westbound San Francisco Zephyr.

RTD Commuter Train #4049 (Hyundai Eagle P3) takes the elevated track as a UP freight runs on the lower track towards the 36th Street Yard.

UP 1507 (GP40N) runs into the North Yard in Denver, Colorado.

Amtrak engine #45 (P42DC) leads the Winter Park Express west on the Moffat Tunnel Sub at sunrise.

BNSF 1746 (SD40-2) sort a string of cars in the yard in downtown Denver, Colorado.

BNSF 1984 (SD40-2) leaves the yard and passes over the South Platte River in downtown Denver, Colorado.

BNSF 1579 (SD40-2) peaks out of the shadows as it waits for servicing at the engine facility in downtown Denver, Colorado.

Norfolk Southern's Savana and Atlanta heritage #1065 (SD70ACe) visits the BNSF engine facility in Denver, Colorado.

BNSF 7905 (ES44DC) leads a freight out of Denver and towards Golden, Colorado.

UP 1357 (ex DRGW GP40-2) waits for its turn to shuffle cars in the North Yard in Denver, Colorado.

BNSF 7799 (ES44DC) runs west out of Denver and will soon arrive in Golden, Colorado where it will pick up cars from the Coors Brewery.

The Amtrak's Winter Park Express Ski Train leaves Denver at sunrise and will arrive at the ski resort in two hours.