RTD commuter rail train #4035 approaches Denver Union Station, passing through a plethora of catenary structures that support the many rail lines to the downtown station.

Rope clouds and a developing sunrise greets passengers on RTD commuter train 4035 as it passes over the Union Pacific's North Yard in Denver, Colorado.

RTD Hyundai-Rotem EMU No. 4035 carries the markers on a two-car B Line train headed to Westminster, departing Denver Union Station on Track 7 on December 18, 2017. A spare train sits on Track 6, t... (more)