Five companies, including Amtrak, have submitted proposals for how they can improve the rail line in an attempt to reduce costs while increasing ridership.
The state plans to upgrade State Road 37 to interstate standards by 2016.
The approved legislation releases $200 million right away but requires state budget committee approval for the second $200 million.
Most of Central Indiana is under travel advisories after this weekend's winter storm.
Many who live and work close to State Road 37 are concerned about the impact of impending construction.
A Senate committee scaled back the amount of money INDOT will receive form the Major Moves 2020 fund.
INDOT spokesman Nathan Riggs says they've used nearly seven thousand tons of asphalt and 8,100 employee hours to fill potholes so far this winter.
Governor Mike Pence announced today that transportation crews are working in two 12-hour shifts each day to repair the roads after the snow storm.
The General Assembly could decide to use $400 million it set aside last year for future transportation projects.
INDOT has already used most of its budget for winter road maintenance with two months of the season still left.