The Berejiklian government is expected to commit to a feasibility study to identify the best route for faster rail services to connect regional areas to Sydney.

With the Liberal-National coalition entering campaign mode ahead of the state poll in March, the government is understood to be set to announce as early as this week that it will consider the feasibility of as many as four routes for high speed, or faster rail services.

The most likely routes to be considered include Sydney-Canberra via the new $5 billion-plus airport at Badgerys Creek, and Sydney-Newcastle.

A commitment to a feasibility study will place the prospect of faster rail on Australia's east coast on the agenda for both the federal and state elections next year.