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The Metropolitan Washington Airports Authority announced Monday afternoon that its contractor has not yet met the requirements needed to turn the Silver Line over to the Metro system.

In a statement, MWAA officials said the new rail line needs additional work and testing before Dulles Transit Partners has achieved “substantial completion.”

There are elevator and escalator problems, water leaks in buildings, and ongoing performance issues with the automated train control system, according to MWAA’s statement.

Substantial completion is a key milestone for the project, as it marks the point at which MWAA can begin to turn over the Silver Line to the Washington Metropolitan Area Transit Authority, which will operate the rail line as part of the Metro system.

Originally slated to open by the end of 2013, the project has encountered multiple delays during the final testing phases, including problems with the train control system.

According to MWAA’s statement, the declaration of substantial completion was deficient in seven of 12 areas required by MWAA’s contract with Dulles Transit Partners.

The contractor has failed to deliver certificates of occupancy for 20 buildings, including stations and the tunnel portion of the rail line.

Some of the required documentation for testing and safety requirements was also incomplete, according to MWAA’s statement.

MWAA has asked Dulles Transit Partners to provide a plan and timeline “for addressing the outstanding items as quickly as possible,” according to the statement.

Once the work is complete and MWAA agrees that the contractor has satisfied the “substantial completion” milestone, WMATA will do its own testing, safety certification and employee training. WMATA has 90 days from when it determines that the line meets standards for “operational readiness” to complete the testing and set a date for the start of service on the Silver Line.

During that 90-day period, the Tri-State Oversight Committee and Federal Transit Administration will also conduct reviews of the new rail line.