Center to Epcot, with trains operating along a single beam on a clockwise loop. A spur track at Magic Kingdom station connects the Express and Resort lines to the maintenance shop. Another spur connects the Epcot and Express lines and is located northeast of the Transportation and Ticket Center. The monorail beams, which are made of concrete with a special polystyrene core to lighten their weight, came by train from the state of Washington. Rolling stock Specifications The trains in use since 1989 are Mark VI trains, built by Bombardier Transportation. Each train is long (consisting of six cars) and can carry 360 passengers. The trains are driven by eight motors which are powered by a 600-volt electrical system running through a busbar mounted on each side of the concrete beam. Each train also has seven inverters on board that convert the 600 V DC to 230 V AC for use by the air conditioners and air compressor, and additionally has a battery-backed 37 V DC low-voltage supply that provides power for the train's electronics. The trains are also equipped with a towing knuckle at each end to allow it to be pushed or pulled by a special diesel-powered tractor if need be. Maximum speed during normal operations is , with several speed zones throughout the system with limits ranging from . These speed limits are strictly enforced by the train's computer and cannot be overridden without the operator engaging a special lockout. Attempting to drive the train too quickly in a given speed zone will result in an "overspeed stop." Train spacing is maintained by the Moving Blocklight System (MBS), also known as the MAPO system (for "Mary Poppins," ), which establishes a number of "holdpoints" throughout the system. At any given time, there must be at least two holdpoints between a given train and the train ahead of it. When the train detects that there are fewer than two holdpoints between itself and the preceding train, the emergency brakes are immediately applied and cannot be released until sufficient spacing becomes available or the operator overrides the system. Failure to maintain adequate spacing is known as an "overrun," and is treated as an extremely serious offense. Below is a list of the models of monorails (and their specifications) that have operated on the Walt Disney World Monorail System: Automation Starting June 22, 2014, the monorail began operating on a