The Arizona Department of Transportation said last week it will complete a route study for a commuter rail line linking Phoenix and Tucson by the end of 2013, but no funding source has yet to be  determined that could provide the $1 billion that such a project is expected to cost.

AzDOT is looking at six potential rail routes linking downtown Phoenix, Phoenix Sky Harbor International Airport, and Tucson International Airport as well as a system of express buses.

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