DALLAS - With construction and fuel costs soaring, metro Denver's Regional Transportation District is considering five options for covering a $2.3 billion funding shortfall for the FasTracks rail system.

Since the first bond issue of $600 million in 2006, the estimated cost of the system has soared from the original $4.7 billion to $7.9 billion, officials told the RTD board in a planning session this week.

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