211-0series
-0 subseries
-1000 subseries
-5000 subseries
-6000 subseries

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Kumoha211


Background and overview
Japanese National Railways (JNR) had continued to deliver 113 series and 115 series suburban DC electric multiple unit (EMU) trains giving some improvements continuously. JNR developed new technologies for next generation of suburban trains, including light weight stainless body, bolsterless bogies, and field added excitation traction control by the appearance of 201 series next generation commuter train and developed 3rd generation of commuter DC electric multiple unit trains, 205 series. Next JNR developed the next generation of suburban DC electric multiple unit trains, 211 series, in 1985. 211 series consisting of 2 motored vehicles and 3 trailer vehicles have same performance as 113/115 series consisting of 2 motored vehicles and 2 trailer vehicles by featuring light weight stainless body, bolsterless bogies, and field added excitation traction control.

Car body
They have 2950mm wide body, incorporating light weight stainless construction. They have the double orange and green waistline and orange headline bands running the length of each car below and above the windows. Cab ends are covered with a Fiber Reinforced Plastics (FRP) panel and electrolytic colouring aluminum black plates are fitted above and below windscreens. 1st class vehicles are equipped with two 700mm wide single-leaf automatic sliding doors on each side of the vehicles. Some drop windows and the other fixed windows are fitted between the doors. Standard class vehicles are equipped with three 1300mm wide double-leaf automatic sliding doors. Drop windows and door case windows are fitted between the doors. Door operating equipments of 1st class is TK103 fitted above the door header of the sliding doors and those of standard class are TK4J fitted under the seatings. Traditional roller-binding destination screens are fitted on the body. The air conditioner is AU71D rated at 28,000kcal/h for 1st class vehicles, and AU75G rated at 42,000kcal for the others. Standard class vehicles have forced draft ventilators fitted on the both side of the air conditioner. Couplers between married pair motored cars feature drawbars and end cars are equipped with the automatic jumper coupler to ease rush-up operations.

Bogies
Their bogies are DT50B/TR235B featuring bolster-less secondary air suspension, corn-shaped multilayered rubber spring journal supporting system, and double collar sealed roller bearing for improved stability at high speed. Traction device of the bogie is multilayered rubber spring.

Traction unit and ancillary equipments
Series-wound brushed DC traction motors, MT61, with a power output of 120kW realize larger torque at low speed and high speed by expanding the field weakening ratio to 35%. The gear ratio is 5.19 to get high traction force at starting and wide speed range of regeneration braking. Eight traction motors of class moha211 and moha210 are controlled by the armature-resistance traction control system, CS57A, featuring field added excitation control and regenerative holding brake, which keep the travelling speed at the holding brake operation starting. If the regenerative brake is not sufficient, additional brake is provided by pneumatic friction brake. Class moha211 vehicles are equipped with a diamond-shaped current collector, PS21, on their roof. Class moha210 vehicles are equipped with a motor driven air compressor, MH3075A-C2000M, and a motor generator, DM106, with a power output of 190kVA featuring brush less, for the auxiliary power supply. The brake system is changed into the electric command pneumatic brake from electromagnetic straight pneumatic brake, which was the standard of JNR electric trains, and the brake response has been improved.

Accommodation
1st class cars have reclining seating, R54, with 970mm seating pitch. Standard class cars have mixture of longitudinal bench seating and transverse bucket seating bays with 1490mm seating pitch for comfort. The air conditioning duct is fitted above the ceiling in order to improve interior design and the outlets of cool air are slit shape. End trailer cars of Kuha211 and Kuha210, and 1st class intermediate trailer cars of Saro211 are equipped with a Japanese style toilet. 1st class intermediate trailer cars of Saro210 are equipped with a conductor's room.

Operations
JNR delivered four car formation 211-0 series to Nagoya region providing additional capacity of rapid services, 1986. These train sets include motored end cars, Kumoha211-0. End cars are not equipped with the automatic jumper coupler. They have the double blue and white waistline and blue headline bands running the length of each car below and above the windows.
After the splitting of the former JNR into the new privatized JR companies in April 1987, JR East, and JR Central received 211 series vehicles.

Additiona delivery
Since JR East and JR Central do not continue to deliver 211 series having mixture of longitudinal bench seating and transverse bucket seating bays, additional 211-0 series of standard class had not been delivered. But JR East developed bilevel trailer vehicles providing 1st class 1st class accommodation and delivered Saro213 vehicles with a western toilet and a wash stand, and Sato212 vehicles with a conductor room. Their body design incorporates stainless steel in order to realize lightweight body, employing weld structure bath-tab shaped underframe made of weather proof high-tension steel sheet having 9mm thick. Air conditioners are AU713 rated at 18000kcal/h, fitted on the roof at both end of the body. Their bogies are TR235G employing anti-rolling stabilizer. Interior layout and accommodation are 2-2 abreast reclining seatins with 970mm seating pitch. Class saro213 vehicles and class saro210 vehicles are coupled and class sato212 and class saro211 vehicles are also coupled in order to insert a bilevel 1st class vehicle to each formation.

Latest operation status
Although 211-0 series delivered to Tokyo metropolitan area had been used on the ordinary services of Tokaido line, they were replaced with E233-3000 series. Now they were relocated to Nagano region. 211-0 series deliverd to Nagoya region are now used on the ordinary services of Kansai line.
Technical Data
Items Data
Supply Voltage 1500VDC
Service speed, etc. Service speed: 110km/h
Length 19500mm
Width 2950mm
Height 4140mm
Bogie DT50B (motored) TR235B (trailer)
Collector PS21
Traction motor MT61 (120kW)
Gear ratio 5.19
Traction system Field added excitation control: CS57A
Air conditioner AU75G (42000kcal/h)
Designed by Japanese National Railways