The Sacramento Regional Transit District (RT) operates 67 bus routes and 38.6 miles of light rail covering a 418-square-mile service area. Buses and light rail trains operate 365 days a year using 182 buses (with an additional 30 buses in reserve) powered by compressed natural gas (CNG) and 11 shuttle vans and 76 light rail vehicles. Buses operate daily from 5 a.m. to 11 p.m. every 12 to 60 minutes, depending on the route. Light rail trains begin operation at 4 a.m. with service every 15 minutes during the day and every 30 minutes in the evening and on weekends. Blue Line and Gold Line trains operate until 12:30 a.m. and the Gold Line to Folsom operates until 7 p.m. Green Line trains operate every 30 minutes Monday through Friday from approximately 6 a.m. to 8:30 p.m. (no weekend or holiday service). Passenger amenities include 50 light rail stations, 31 bus and light rail transfer centers and 18 park-and-ride lots. RT also serves over 3,300 bus stops throughout Sacramento County. RT's entire bus and light rail system is accessible to the disabled community. Also, RT provides a door-to-door transportation service (in accordance with its responsibilities under the Americans with Disabilities Act) for Sacramento area residents who are unable to use fixed-route service. RT provides this service through a contract with Paratransit, Inc.