in two lengths: Type A, a short version with five sections, and Type B, a longer, seven-section version. Since 1995, one prototype of each length operated on the network. Since 1997, series production versions of both types have been in service. Type A1, a further development of Type A, has been in service since 2007 as the first generation of Vienna tramcars to be fitted with air conditioning. These cars have an updated interior design (yellow handrails, gray walls and red plastic seats) and door-closing indicator lights. They are currently used on lines O, 9, 10, 33, 37, 42, 44, 46, 52 and 62. Deliveries of the longer ULF version, Type B1, began in April 2009, and are currently found on lines D, 1, 2, 5, 6, 18, 25, 26, 31, 38, 40, 41, 43, 49, 60, 67 and 71. After a fire in one of the low-floor trams in July 2009, it was decided to retrofit all of them with special fenders. Since 2014, six seats in the second and last sections of Type B and B1 trams have been permanently removed and replaced with two folding seats and 16 standing places to accelerate passenger transfer and increase capacity. Non-air-conditioned trams Type A – 51 cars (Fleet no. 1 to 51) – built 1995–2006; seats: 42, standing places: 94. Type B – 100 cars – (Fleet no. 601 to 701) - built 1995–2005; seats: 66, standing places: 141. Air-conditioned trams Type A1 – 80 cars (Fleet no. 52 to 131) – built 2006–2015; seats: 42, standing places: 94. Type B1 – 100 cars ( Fleet no. 702 to 801) – built 2009–2017; seats: 66, standing places: 143. Bombardier Flexity Wien In 2015, Bombardier Transportation's specially-designed Flexity Wien series won against the ULF from Siemens in a tender for 119 new trams, including an option for a further 37 units, purchased with a maintenance agreement. The trams, based on the Adtranz Incentro design, are 34 metres in length and have six double-leaf doors, one fewer than the long ULFs. They have a capacity of 211 and a floor height of 215 millimetres to provide ground-level boarding. They are produced in Bombardier's Vienna factory and have been delivered to Wiener Linen since the end of 2017, entering service out of Favoriten depot in December 2018, initially on line 67 and later lines 6, 11, 18 and 71. Internally designated as Type