Officials building a subway line to Dulles International Airport say Metro is charging too much for rail cars -- so much, in fact, that the opening of the extension could be delayed. 

Metro plans to have the Dulles rail project pay the entire cost of developing the cars needed for the subway line extension. Officials from the Metropolitan Washington Airports Authority call the strategy unreasonable, noting that the investment will benefit the entire Metrorail system.

"It is not possible, nor is it reasonable, for the [Dulles rail] project to bear all these costs," authority President James E. Bennett told interim Metro chief Richard Sarles this month in a three-page letter obtained by The Washington Post.

The Metropolitan Washington Airports Authority is overseeing construction of the 23-mile rail line, which will stretch from East Falls Church to the airport and into Loudoun County.

Read more in The Washington Post....