The MTA is testing a program that would allow subway riders who also take the Long Island Rail Road or Metro-North to purchase a combined ticket that they can keep on a phone app.

The commuter-railroad conductors would scan the app to validate the tickets while the riders would scan their phone over a special reader at a subway turnstile.

For now, the MTA is testing subway turnstiles that accept the app at Bowling Green and the two Wall Street stations, although only with employees.