The Senate scrapped a House-passed bill to let Marion and Hamilton Counties vote on a local income-tax hike, in favor of a legislative study committee.
Numbers from Ball State University show the state's bus ridership could more than double in the next 20 years.
A House committee will vote Wednesday on a bill that would allow Marion and Hamilton County voters to decide whether to raise local income taxes.
Mayors around the state say a mass transit plan in Central Indiana could increase the taxing authority of local governmental bodies.
Phase one of a mass transit plan would cost the state $136 million per year until 2021.
Mayor Greg Ballard met with House Speaker Brian Bosma and Senate Appropriations Chairman Luke Kenley at the Statehouse on Wednesday.
The plan could include an express bus line or a fixed-guideway system, such as a train, according to Hamilton County commissioner Christine Altman.