DALLAS — With an unprecedented number of projects underway or in planning, the North Texas Tollway Authority expects to get a Fort Worth turnpike completed six months later than expected in 2011 as it copes with rising costs on the controversial downtown Trinity Parkway in Dallas.

The delay on the $1 billion Southwest Parkway in Fort Worth is due to a lack of agreement with Union Pacific Railroad on construction of an overpass at the Davidson Railyard. Railroad officials say they are still reviewing the effect of the project on their traffic and are not ready to sign an agreement.

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