321 series

The 321 series is a Japanese city commuter electric multiple unit operated by the West Japan Railway Company since December 2005.
==History==
The 321 series was designed to complement the 207 series used on various lines around the region. The first set entered service on 1 December 2005 to replace 207 series sets Z16 and S18 which were involved in the Amagasaki rail crash that year.
A total of thirty-nine seven-car sets were built from 2005 to 2007 by Kinki Sharyo, numbered D1 to D39. They are based at Aboshi Depot.
==Design==
The 321 series adopted a modern design language started by the 207 series.
==Specifications==
Construction is of stainless steel. End cars are 19.5 meters long while intermediate cars are 19 meters long. The 321 series make use of two-level insulated gate bipolar transistor variable frequency drives manufactured by Tōyō Denki Seizō, which have a distinctive, high-pitched cadence. 
Various other sets, such as D27, also have variable frequency drives manufactured by Hitachi, which sound very similar to those manufactured by Tōyō Denki Seizō, except being somewhat more shrill and the sound being sustained for longer. Newer sets, such as D34, may have also had their Tōyō Denki Seizō drives changed out for Toshiba drives, which have more of a quieter wooshing sound.
The 321 series is equipped with a musical horn which is standard on most of JR West's commuter fleet.
==References==
*Wikipedia.org
Category:JR Group trains
Category:Electric trainsets
Category:Kinki Sharyo locomotives