RTD’s cumbersomely named University of Colorado A Line — it cost CU $5 million for the “branded sponsorship” — is an A Train linking Union Station with DIA, covering 23 miles of commuter rail that can be traversed in 37 minutes.
With its April opening, Denver joined a growing number of American cities where travelers can take a train to a plane and back. Not all of these have proven a success. San Francisco’s BART extension provides access to nearly 10 million Bay Area residents, where daily commutes are frequently horrific and ridership has been high. Philadelphia, by contrast, runs virtually empty cars several times an hour.