Are CharlieCards RFID?

So the four teens extended other research done by the 2008 hacker team to fully reverse engineer the CharlieCard, the RFID touchless smart cards the MBTA uses today.



Yes, the CharlieCard used by the Massachusetts Bay Transportation Authority (MBTA) in Boston is a "contactless" smart card that utilizes Radio Frequency Identification (RFID) technology—specifically, it is based on the MIFARE Classic 1k standard. Inside the plastic card is a tiny chip and an antenna coil; when you "tap" the card against a black target on a fare gate or bus farebox, the reader emits an electromagnetic field that powers the chip and allows it to communicate the card's balance and serial number via radio waves. This is why you don't need to physically touch the reader or "swipe" a magnetic stripe. As of 2026, the MBTA is in the final stages of transitioning to a more advanced "AFC 2.0" system, which supports newer RFID standards like EMV contactless (allowing you to tap your smartphone or credit card directly), but the original RFID CharlieCards remain a staple for commuters and pass-holders throughout the system.

People Also Ask

The CharlieCard is named after the lead character in the 1948 protest folk music song, M.T.A.. The song was written to protest a fare increase in the form of an extra five cent exit fare for longer rides and was later made popular by the Kingston Trio in 1959.

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CharlieCards are reusable cards that can be loaded with cash value or passes to pay bus and subway fares. CharlieCards are available at fare vending machines in most subway stations.

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Local Bus and Subway You can add a monthly pass or up to $50 in stored value (per transaction) to your existing CharlieCard, valid for use on subway, bus, and Silver Line buses.

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Monthly passes are specific to the agency where you buy it. For example, you can have a monthly pass for the MVRTA and one for either the LRTA or MBTA. How much money can I add to my card? You can add up to $100 on a full fare Charlie Card or $40 on a ½ fare card.

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On all MBTA buses, you can add cash value to your CharlieCard with coins or bills, up to $20. You cannot buy or reload 1-day, 7-day, or monthly passes at onboard fare boxes. To pay your fare: Tell the driver you need to add value to your CharlieCard.

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The Tremont Street subway in Boston's MBTA subway system is the oldest subway tunnel in North America and the third oldest still in use worldwide to exclusively use electric traction (after the City and South London Railway in 1890, and the Budapest Metro's Line 1 in 1896), opening on September 1, 1897.

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Tap your CharlieCard on the farebox target, or insert your CharlieTicket into the machine with the orange arrow facing up and away from you. Insert cash or coins up to your desired value. Change is not returned from onboard fare boxes, so any cash you insert will be loaded onto the card or ticket.

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With the new MBTA mTicket App for Commuter Rail and Ferry, you can securely purchase MBTA Commuter Rail and Ferry Single Ride, Round-Trip, and 10 Ride tickets in seconds. Purchasing a ticket is easy: select your trip & ticket type, enter your payment card information and your smartphone is your ticket!

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Updated on-screen prompts at fare vending machines will help you purchase a tappable CharlieTicket or purchase/reload a CharlieCard. You can now pay using Apple Pay, Google Pay, Samsung Pay or contactless credit/debit cards. You can also use your credit/debit card, EBT card, or cash.

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Credit and debit cards are accepted. You can purchase one-way, round trip, and monthly Commuter Rail passes for all zones at ticket booths at: North Station.

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Making Things Fare Silver Line riders pay and validate their fare when they board through the front door of the bus. Simply tap your Wave card at the blue Wave reader at the front of the bus when boarding. If you don't have a Wave card, you can pay cash as you board through the front doors.

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