A pair of UP SD70Ms are pulling four electric units that will be used on commuter rail. The units were built by Siemens and are headed for Pennsylvania. RTD's "A Line", which runs from Union Station to Denver International Airport, follows UP's Limon Sub for much of the run. Here, just west of Airport Blvd, the A-Line ascends and crosses over the Limon Sub. If only a commuter train has passed over right at this moment!
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