The ticket is inserted into a slot in the gate or farebox, the fare is deducted, and the remaining balance is displayed on a small screen. The ticket is then returned to the rider even if there is no remaining value. On September 18, 2008, two 150-bike parking cages were made available at the Alewife station, next to the MBTA parking garage. Since then, a number of MBTA stations have been provided with secure, monitored bicycle parking cages. See Massachusetts Bay Transportation Authority#Bicycles for details. Previously, access to these cages required a free special Bike CharlieCard. But as of the spring of 2013, any CharlieCard can be registered for bike cage access. CharlieCards can be reloaded, and CharlieTickets can be purchased and exchanged for new ones at Fare Vending Machines (FVMs) in transit stations, and elsewhere in the system including buses. All FVMs accept credit and debit cards; most also accept cash and coins. The AFC fareboxes on buses and light rail trains accept CharlieCards, Change Tickets, CharlieTickets, cash (up to $20 bills), and coins. When customers pay with cash on the bus, they may receive their change on a "ChangeTicket". The MBTA gives a discount for CharlieCard users that began with the fare increase that took effect on January 1, 2007, and continuing with later increases. For example, a subway or trolley ride costs $2.40 with a CharlieCard but $2.65 with a CharlieTicket or cash. Local bus riders get a $0.50 discount with a CharlieCard ($1.60 vs $2.10),express bus riders pay an extra $1 or $1.50 depending on the route, and similar surcharges had been planned for commuter rail, and harbor ferries, but not THE RIDE. The MBTA also plans to continue providing the cards themselves free of charge, at pass offices, at stations throughout the system, at local retailers, and online. There is also a senior citizen/disabled citizen Charlie pass, with reduced fares for qualifying individuals, called a "Senior/TAP" (Transportation Access Pass) CharlieCard. Middle school and high school students also can obtain a discounted CharlieCard. The bulk of the MBTA's vehicles and stations were transitioned to the CharlieCard-compatible system throughout 2006, with Fields Corner the last to be converted on December 22, 2006. Fare Vending Machines are available at all underground stations, as well as on the baggage-claim level of Logan International Airport terminals, inside Fenway Park, and at all stations on the Green Line D branch.