More than £15.5 million is being requested from Bucks public authorities to fund the East West rail line that will link Aylesbury to Milton Keynes.
The £500 million project is mainly being funded by the Government, but as part of the deal local authorities agreed to provide £50m.
Following negotiations, Bucks County Council has been asked to contribute £10.1 million while Aylesbury Vale District Council has been asked for £5.4 million.
Payments will be spread over 15 years, with the district council paying with money from the New Homes Bonus scheme – cash from new housing developments.
The line, which will create a new station at Winslow, is expected to open in 2017.
Councillor Carole Paternoster, cabinet member for strategic planning, said the line will benefit the whole district.
She said: “It will bring us strategic rail infrastructure that we desperately need.
“It will bring more economic development to the area.
“It’s going to open up the whole area as a major transport route.”
The district council’s cabinet is due to meet tomorrow (Tuesday) to discuss its contribution.