The TW 6000 is a type of articulated light rail vehicle used on the Hanover Stadtbahn system, manufactured by Duewag, Linke-Hofmann-Busch, AEG, Kiepe and Siemens. The vehicle can serve both high platforms and street-level stops; it has cabs at both ends, thus eliminating the need for turning loops. It was unique in Germany at the time for featuring thyristor chopper control and a contemporary design by Herbert Lindinger. A total of 260 were built between 1974 and 1993, of which the first series of 100 was built by Duewag in Düsseldorf from 1974 to 1978, whilst the second to eighth series (160) were built by LHB in Salzgitter from 1979 to 1993. From 2002 on, 82 units were sold to Budapest, Hungary and The Hague, The Netherlands. In 2013, üstra ordered 100 new vehicles (with an option for 46 more) to replace the aging TW 6000 vehicles; those vehicles, which are known as the TW 3000 were delivered between 2014 and 2018. Technical parameters A single unit has a length of and a width of . Up to 150 passengers can fit into a single car; up to four sets can be operated in multiple. The maximum speed is rated at . The two DC motors are rated at 218 kW at 600 V each and can draw a maximum current of 900 A. Cars 6206-6260 are microprocessor controlled, using an Intel 8085 and GTO thyristors. Series delivered The following TW 6000 series were delivered: The lead of the consortium changed over to LHB after the first series due to political lobbying, as subsidies provided by the state of Lower Saxony were spent on the project, LHB (which is based in Salzgitter) was favoured over the out-of-state Duewag (with their operations in Düsseldorf, North Rhine-Westphalia). Cab controls All TW6000s are driven using an integral traction and braking system with a deadman's trigger that drivers must depress to mobilize the vehicle. When released while moving, first the warning system beeps, and then the track brakes are applied. Changes in Series 2 New floors, lacking the Series 1 furrows Smaller stop buttons and warning lights, partly retrofit to Series 1 from 3/81 to 5/85, completely retrofit to Series 1 from 10/88 to 11/92 Destination indicator inside the Stadtbahn vehicle Wiper moved to the right Automatic adjustment of couplers after decoupling Additional brake resistor on the roof Preparations to add additional seats at