DALLAS — Colorado’s Regional Transportation District should shelve plans to for a tax-hike referendum this year or risk rejection of additional funds to complete the FasTracks rail projects by 2017, according to an advisory group.

At a meeting on Tuesday, the RTD Board will take action on the 2011 FasTracks Financial Plan, including whether to pursue a sales-tax increase and at what level. The board needs additional revenue to complete the $6.5 billion FasTracks project by its original target date of 2017.

Much of the work approved in a 2004 bond election is already underway, ­including a commuter-rail link between Denver International Airport and downtown Denver’s Union Station.

However, this year does not look promising for voter approval of a sales-tax hike, according to the Coalition for Smart Transit that advises the RTD board.

John Huggins, executive director of the coalition, and RTD political ­consultant Maria Garcia Berry said that an older and more conservative electorate that typically votes in off-year elections would probably not ­approve.

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