The Southeastern Pennsylvania Transportation Authority is working with a unit of Xerox Corp. to add contactless payment acceptance at public-transit turnstiles.

Xerox's Affiliated Computer Services Inc. said Tuesday that the $122.2 million deal will enable commuters to pay with credit and debit cards as well as, eventually, their smartphones. The deployment will take three years.

SEPTA is a Philadelphia agency that operates that city's public transportation services. ACS, of Dallas, has similarly worked on contactless payment deployments in New York with New York's Metropolitan Transit Authority, the Port Authority of New York and New Jersey, and New Jersey Transit.

"This new system will allow customers to spend more time where they want to be and less time getting there or waiting in line," says Dave Amoriell, ACS' chief operating officer of transportation and local government solutions.

Xerox, of Norwalk, Conn., bought ACS in February 2010 for about $6.4 billion.