remained until 11 May 2004 when they were acquired by rail engineering company Pars Nova a.s. in Šumperk, where they undergone major refurbishment and re-painting to new livery used by third revision vehicles in Bratislava. Continuous service began on 13 December 2006 and both vehicles are coupled into one set. They now carry registration numbers #7957 and #7958 and slightly differ from rest of the fleet due to different front and rear coupler. More than half of the 296 trams, namely 150 copies, were between 1995 and 1997 to the Prague City Transport Authority (DPP) delivered. The vehicles were already conceptually and technically outdated when they were commissioned. Between April 2016 and June 2019, 40 ex-Prague T6A5/III trams were delivered to Sofia, Bulgaria, where they underwent an upgrade to their visual and acoustic information systems. Some of them also underwent major refurbishment. Trams retired from Prague were also sent to Kharkiv, Kyiv and Kamianske in Ukraine. In the spring of 2021 there were just three T6A5 in the Czech capital in regular service to be found, mainly in night traffic and on lines 20 and 21. This era ended on 18. June 2021 - the Tw 8637 made its last lap with an early course on line 21. Design and construction Vehicle has angular steel construction with large windows, 3 collapsible doors on the right side and is painted with red-cream livery. Interior was fitted with leather seats, rubber anti-slide floor and was universally made with cream window frames and gray roof and floor. Chassis is mounted on two bogies, has four axles and every axle is connected to one traction motor. Traction motors are controlled via pulse converters. Current collection from trolley wire is done via pantograph. Construction of bogies used for T6A5 is based on North American PCC standard. Operation T6A5 can drive as solo vehicle or can be coupled in to train set from two or three cars. Two-car sets and solo vehicles are always used, Three-car sets are used very rarely, mostly for testing purposes. Tram sets are connected with electric couplers and only one pantograph is used for powering the entire set. Maximum design speed is . At the start of operation in Bratislava and Košice, speeds as high as were achieved during special tests. But due to poor track maintenance and condition, they don't drive faster than . Only exception is light rail line