Sotetsu 20000 series

The Sotetsu 20000 series is a Japanese city commuter electric multiple unit operated by the Sagami Railway since February 2018. This article also details the later 21000 series, a derivative of the 20000 series 8 cars in length.
==History==
The concept design of the train was published on 10 March 2016, which ended up becoming the actual design of the train when it was manufactured. The first details of the sets were only published a year later in June 2017, with the first set being delivered from Hitachi's Kasado Factory in Kudamatsu, Yamaguchi in late July 2017.
The set was initially supposed to enter service in December 2017 to commemorate the 100th anniversary of the Sagami Railway's founding, however, a press release from the railroad dated 21 December 2017 postponed the set's entrance into service to 11 February 2018, which was when the set actually entered service.
The set is currently in service and is based at Kashiwadai Depot. More sets will enter service over the coming years, and will ultimately be used on Sōtetsu-Tokyu through-running services commencing in fiscal 2022. Shorter 8-car sets classified as the 21000 series entered service on 6 September 2021 and are ultimately intended for use on through-running services through to Tokyu lines.
As the sets were regarded as having the most outstanding functional and design features, the 20000 series is the recipient of the 2019 Laurel Prize.
==Design==
The sets have a modern appearance with a slightly streamlined profile. The cabs of the sets were designed by Keita Suzuki with design inspiration from JR Group's Blue Train sleeper trains. The sets are the first sets used by Sōtetsu that are painted in the Sōtetsu YOKOHAMA NAVY BLUE (stylized in all caps) corporate color scheme from the start; however, they are not the first sets to be painted in the YOKOHAMA NAVY BLUE color scheme. The YOKOHAMA NAVY BLUE paintscheme was conceived by Manabu Mizuno as part of Sōtetsu's Sōtetsu Design Brand Up Project.
==Specifications==
Construction is of a double-skinned aluminum alloy based on the Hitachi A-Train concept. The sets' traction system is a two-level insulated gate bipolar transistor hybrid system with Schottky diode and silicon carbide MOSFET elements; on acceleration, these drives produce a loud, high-pitched hiss that steps up in pitch.
The sets feature interior LED lighting; the color temperature of the LED lights are adjusted automatically according to the time of day and season (i.e. the lights will be adjusted to have a warmer hue during late evenings). A table showing the hue colors is shown below.
 
Hues shown are illustrative only and may not be reflective of what you may see.
Season 	Time of day 	Color temperature [K]	Intensity [%]	
Spring(1 April - 30 June) 	Early morning 	02:01:00 - 06:59:59 	4400 	90
Morning peak 	07:00:00 - 09:59:59	5000 	90 	
Daytime 	10:00:00 - 15:59:59	4400 	90 	
Evening 	16:00:00 - 17:59:59	4400 	90 	
Night 	18:00:00 - 02:00:59	3000 	100 	
Summer(1 July - 30 September) 	Early morning 	02:01:00 - 06:59:59 	5000 	90
Morning peak 	07:00:00 - 09:59:59	5000 	90 	
Daytime 	10:00:00 - 15:59:59	5000 	90 	
Evening 	16:00:00 - 17:59:59	4400 	90 	
Night 	18:00:00 - 02:00:59	3000 	100 	
Autumn(1 October - 31 December)	Early morning 	02:01:00 - 06:59:59 	4400 	90
Morning peak 	07:00:00 - 09:59:59	4400 	90 	
Daytime 	10:00:00 - 15:59:59	4400 	90 	
Evening 	16:00:00 - 17:59:59	3800 	100 	
Night 	18:00:00 - 02:00:59	3000 	100 	
Winter(1 January - 31 March) 	Early morning 	02:01:00 - 06:59:59 	3300 	100
Morning peak 	07:00:00 - 09:59:59	3800 	100 	
Daytime 	10:00:00 - 15:59:59	4400 	90 	
Evening 	16:00:00 - 17:59:59	4400 	90 	
Night 	18:00:00 - 02:00:59	3000 	100 	
==References==
*Wikipedia.org
Category:Hitachi locomotives
Category:Sōtetsu trains
Category:Electric trainsets