TEXRail commuter rail service will not start transporting passengers on Saturday, Jan. 5, as originally planned, according to a statement published on the Trinity Metro social media pages and official website.

Trinity Metro was unable to obtain full clearance from the Federal Railroad Administration for its 27-mile route, which runs from Fort Worth through Grapevine to Dallas-Fort Worth International Airport, according to Trinity Metro's Facebook page. Officials commented that they will continue to operate in testing mode until it gets approval for passenger service, according to Trinity Metro’s Facebook page.

The statement did not give a reason for the lack of clearance. It's unclear whether the agency, which is part of the U.S. Department of Transportation, is affected by the federal government shutdown, which began Dec. 22.

The commuter rail line has been planned for more than 15 years. It has nine stops along the 27-mile route that ends at the airport's Terminal B.