DALLAS — The funding gap for the Denver area’s FasTracks transit plan has grown to $2.5 billion — a $300 million increase since 2009 — even though the construction cost estimate has fallen by nearly the same amount, according to the Regional Transportation District.

To complete the now $6.7 billion project by the original deadline of 2017, voters will need to approve a doubling of sales tax revenue in a referendum expected to be called this spring, according to officials.

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