Arizona transportation officials studying the feasibility of a passenger rail line between Phoenix and Tucson have narrowed the list of alternatives to three.

State Department of Transportation officials said Tuesday that all three alternatives would run along Interstate 10 south of Eloy.

One alternative would share the right of way with Union Pacific Railroad north of Eloy.

ADOT has been working with federal officials, local governments and planning organizations in Maricopa, Pinal and Pima counties to determine which routes to further study.

Nearly 7,000 Arizonans completed surveys with ideas of which routes would best serve the communities along the proposed rail line.

ADOT hopes to have one preferred alternative for further study by the end of this year.

However, there currently isn’t a construction schedule or funding for the project.