Your train ride could be going high-tech!

The MTA is exploring a plan to bring wireless Internet to Grand Central Terminal, Penn Station and two commuter rail services.

The agency has invited companies to submit proposals for installing Wi-Fi on Metro North and the Long Island Rail Road. The company that wins the project will have to finance it themselves, since the MTA can't afford the project right now.

It's still unclear whether riders would have to pay for Internet service, or whether providers could come up with a way to offer it for free.

A source said the MTA is looking to have the system up and running by the end of the year.