BOSTON (WHDH) -- The MBTA is launching a mobile phone application for commuter rail riders.

The app is launching on Saturday -- 100 customers will pilot the program for a few months before it is released to the general public.

The MBTA unveiled the new program on Friday at Boston’s Park Street Station, America’s first subway station, a fitting location because the agency said it’s the first commuter rail to launch this kind of app in the U.S.

The program is modeled after a program already in place in London.

“Today, when you buy your ticket, we are literally duplicating technology probably from the 1850’s,” said Mass. Transportation Secretary Richard Davey. “You bought a ticket from a conductor, paper ticket, and it was punched.”

The commuter rail system covers 600 miles, which means the app could potentially affect thousands.

Riders had mixed reactions to the new app.

“I think we’re going a little too far. I mean, all you gotta do is hand the guy your money and that’s how you buy your ticket,” said Henry Corley.

“I think that’s great. I think being able to not have to stop at the machine is great and to be one the T and coming on the commuter rail and stop, not have to stop rushing where you’re going to actually buy your ticket is really helpful,” said one commuter.