to U.S. Steel factory in the outskirts of Košice, where all trams, not just T6A5, drive at which is maximum speed for this area. Information system contains front, side, back and internal panel. Production Note: This is the list of first owners. Stock may have later been resold to other cities not on this list. Development Since its debut, T6A5 was made in three versions, most changes made were minor and were mostly visual as vehicle's electronics and mechanics remained unchanged. First revision The First revision (noted as T6A5/I) is the oldest revision, featuring red-cream livery and classic gray-cream colored interior. Second revision Second revision (noted as T6A5/II) is minor revision and only featured improved wheel slide protection, different pantograph and tilt sash windows. Third revision Third revision (noted as T6A5/III) saw renewed livery, redesigned interior, doors, driver's air conditioning, plastic seats with textile coating, new pantograph and electronic information displays. T6A5.3 The T6A5.3 is modification of classic Tatra T3 to T6A5 using new replacement chassis and old parts and bogies from T3. This was an experiment in Prague made to find a cheaper ways to restore fleet. Only one vehicle of this kind was built in 1998, but due to its atypical origin, it was not operated in regular service because of low reliability. In August 2012 the vehicle was scrapped. Operation in North America ČKD attempted to enter United States market when New Orleans Regional Transit Authority, public transport operator in New Orleans, Louisiana proven interest in T6A5 in the late 1990s, but due to several atypical properties of New Orleans streetcar system, such as rail gauge, trolley wires and customer's requirements, T6A5 had to be heavily modified to meet them. As a result, Tatra T6C5 was developed which was bi-directional, had pair of doors on both sides, air conditioning and alongside pantograph, the pair of trolley poles installed on both ends of the vehicle. Only one unit was built in 1998 and has been tested in New Orleans between 1999 and 2001. American operators were satisfied with the vehicle but due to upcoming bankruptcy of ČKD they canceled the order and returned the vehicle to Europe. In 2003, T6C5 was sold to Strausberg, Germany where it remains in operation as of today. Accidents and incidents On 19 January 2009 in Košice, the two-car set #618+619 had an accident with rigid truck on railway crossing followed with derailment