Chiltern Railways has announced it wants to start a new service between Oxford and London Marylebone.
The company intends to run trains via a new line connecting the Chiltern line to the East-West line.
The proposed service would mean a new station for Kidlington and upgrades for Islip and Bicester stations.
Chiltern Railways has hired environmental consultants and will hold three public exhibitions in Oxford, Kidlington and Bicester this spring.
Adrian Shooter, Chiltern Railways' chairman, said: "This project will only succeed if we give the people of Oxfordshire the service they want.
"This is why we not only want to explain our plans to them but especially to hear what they themselves want," he added.
The planned route would create frequent services between Oxford, Islip and Bicester stations. All three stations would be upgraded to accommodate the service.
A new station will be built at Water Eaton Parkway in Kidlington, offering commuters park and ride facilities.