The MBTA won't be reinstating late night bus service. Before commuters can rely on the agency to get them to work in the wee hours of the morning, the T says it needs to find a way to keep costs down for the proposed line.

The T's board delayed a vote Monday on a nine month pilot project to offer bus service along a key corridor from Mattapan Center to Revere that would connect downtown and job centers like the airport and Longwood Medical Center.

"So we are proposing with this a way we can connect residents throughout Boston, Chelsea, Revere and beyond to some of the great job centers in  our area," said Chris Osgood, a proponent of the line who works with the coalition that presented the proposal to the T's Fiscal and Management Control Board Monday.

Support for GBH is provided by:

The MBTA estimates that late night buses will serve 75,000 riders annually, about 200 rides per night. That level of ridership will bring in $38,000 a year in fares but it will cost the T over $2 million to operate it, meaning each trip will cost the state $27 in subsidies.

MBTA General Manager Luis Ramirez opposes moving forward with the plan, telling the board Monday in his remarks that the T must show fiscal discipline before adding services.