Tokyo metro 6000 series

Construction is of an extruded aluminum alloy. End cars are 20 meters long, 2. Prototype set used a thyristor chopper-based traction control system in an effort to put the thyristor chopper-based traction system into practical use. Later sets adopted a very similar system, with Mitsubishi and Hitachi providing the thyristor chopper systems; those produced a low drone when the train accelerated from idle.

Even later sets used a gate turn-off thyristor-based chopper control system which sounded quite similar to the above systems, except for a pitch change. Starting in the s, most older sets received "Type B" refurbishment; improvements included the addition of automatic station broadcasting systems, addition of wheelchair spaces and the changing of the roller blind-type destination indicators to three-color LED indicators among other improvements.

Another notable improvement was the changing of the chopper control systems to variable frequency drives; the drives were manufactured by Mitsubishi or Hitachi in two- or three-level formats. All variable frequency drives supplied were insulated gate bipolar transistor-based drives. Two-level Hitachi drives produce a loud hissing sound , three-level Hitachi drives produce a melodic wail , two-level Mitsubishi drives produce a subdued hissing sound and three-level Mitsubishi drives produce a rather unique cadence that sounds oddly like an older GTO inverter.

Newer sets received "Type C" refurbishment which was much smaller in scale, where work was done mainly to paintwork and interior work and modifications to body construction.

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