used by Amtrak. The push-pull equipment is used primarily for peak express service because it accelerates slower than EMU equipment, making it less suitable for local service with close station spacing and frequent stops and starts. As of 2012, all cars have a blended red-and-blue SEPTA window logo and "ditch lights" that flash at grade crossings and when "deadheading" through stations, as required by Amtrak for operations on the Northeast and Keystone Corridors. SEPTA's railroad reporting mark SEPA is the official mark for their revenue equipment, though it is rarely seen on external markings. SPAX can be seen on non-revenue work equipment, including boxcars, diesel locomotives, and other rolling stock. The Silverliner coaches were first built by Budd in Philadelphia and used by the PRR in 1958 as the Pioneer III for a prototype intercity EMU alternative to the GG1-hauled trains. Similarly designed cars were purchased in 1963 as Silverliner II units. In 1967, the PRR took delivery of the St. Louis-built Silverliner III cars, which featured left-hand side controls (railroad cars traditionally have right-hand side controls) and flush toilets (since removed), and were used primarily for Harrisburg-Philadelphia service. The Silverliner II and III cars were designated under the PRR MP85 class. Some Silverliner III cars were converted for exclusive Airport Line use; they featured special luggage racks where the old toilet closets were located, yellow window bands, and the Philadelphia International Airport's PHL" logo. The bulk of the fleet are Silverliner IV coaches built by General Electric in Erie with carshells from Avco and Canadian Vickers; these were delivered in 1973–76, before the formation of Conrail. In 1990, the Reading-era "Blueliner" and PRR-era Pioneer III/Silverliner I coachers were retired. In 2002, SEPTA announced the building of 104 new Silverliner V cars to replace the Silverliner II and Silverliner III. SEPTA retired the Silverliner II and Silverliner III cars in June 2012 and replaced them with the Silverliner V model. A total of 120 new Silverliner V cars were built, with the first three entering service on October 29, 2010. The cost for all 120 cars is $274 million, and they were constructed in facilities located in South Philadelphia and South Korea by Hyundai Rotem. The cars were built with wider seats and quarter point doors for easier boarding or departing at high-level stations in Center City. As of March 2013, all 120 cars have been delivered, and are in