Background and overview
JR West developed 227-0 series suburban DC electric multiple unit (EMU)
trains for Hiroshima region employing the safety countermeasure against
the head-on, lateral, and offset collision, the body vibration detector
to prevent damage caused by derailment and collision from spreading, and
D-TAS signaling system employing on]board database in order to displace
superannuated 103 series, 105 series, and 115 series EMU in 2014. The original
design was closely based on the 225 series EMU used around Kansai area.
227-0 series adopt two-car sets and three-car sets to make from two to
eight car sets flexibly to be found on transportation volume in Hiroshima.
11 three-car sets and 2-two car sets were delivered over the period from
September 2014 until March 2015.
Car body
They have 2950mm wide body, incorporating light weight stainless construction
and same cross-section shape as that of 225 series EMU. Their body employs
2mm thick skin and features laser beam welding for the improvement of body
strength and reduction of skin distortion of side construction. In addition,
their cross member of the underframe, side column, and carline are positioned
longitudinally to form ring shape construction for more intense strength
against lateral collision. Bodies are unpainted and have the red thick
vertical bands at the both ends of the body side and white waistline band
with red strips running the length of each car below the windows. They
also have brown accents applied at door cases. Cab ends constructed by
4.5mm thick plate using hot-rolled atmospheric corrosion resisting steels
(Steel Marine Atmospheric) for welded structure in order to protect against
obstacles at the level crossing are fitted with a gangway door with the
gangway connection base. Cab end employs the frontal impact accident measure
that shock absorbing beams above the cab ceiling to absorb the impact energy
and widen the lower part of cab space. A train classification sign featuring
colour-selectable LED is fitted above the gangway door and a colour-selectable
LED destination indicator is above the control desk. Two headlights and
auxiliary lights applied high intensity discharge (HID) lamps are aslant
fitted nearer to each side of the gangway than 225-0 series and uniquely
shaped LED trail lights are fitted toward out of the headlights and auxiliary
lights. They employ a higher mounted driver's cab to improve forward visibility.
Their floor level is 10mm lower than 223-2000 series to realize a low centre
of gravity and to eliminate the level difference between platforms and
the floor for accessibility. Anti-fall plates between vehicles are also
introduced between the vehicles and at the cab end. They are equipped with
three 1300mm wide double-leaf automatic sliding doors on each side of the
vehicles. Door operating equipments, WTK131, having closing strength attenuated
mechanism, door nipping detector and flashing alarm lamps while door opening/closing
are fitted above the door header of the sliding doors which can be operated
manually by pushing the buttons fitted beside the door. Displays showing
entrance or exit are ready to be fitted on the door case beside the doorways
on the both ends for conductor-less operation. A large fixed window and
two drop windows on each side of a large fixed window are fitted between
the doors. Heat absorbent double-glazing glass is employed for all windows
in order to improve noise and thermal insulation property and prevent their
windows from dew condensation. A large colour-selectable LED destination
screen fitted on each side of the body is integrated with train classification
sign. Two air conditioners, WAU708B, rated at 22,000kcal/h/unit, are fitted
on their roof. Loudspeakers, providing guidance broadcast for passengers
waiting at a station, are fitted inside each air conditioner. Electric
fans of air conditioner supply fresh air into the passenger room, instead
of ventilators on the roof. End cars are equipped with the automatic jumper
coupler to ease rush-up operations. Platform detecting ultrasonic sensors
are fitted on each side of end section to prevent the passenger from falling
down when all or part of the train is not at a platform.
Bogies
Motored bogies are WDT63B, trailer bogies of end vehicles are WTR246G, and trailer bogies for intermediate vehicles WTR246F featuring bolster-less secondary air suspension, axle arm type journal box supporting system, and the single link traction device. Their bogie employing bow-shaped bogie frame to lower the fitting position of bolster suspension realizes to lower the floor level. These bogies feature 2000mm wide distance between two secondary air suspension to ensure smooth ride characteristics even at 110km/h, the yaw dampers and anti-rolling stabilizer are ready to be fitted. Quiet Westinghouse-Natal drive is applied for power transmission device. The gear ratio is 6.53 to get high acceleration performance and the maximum service speed at 130km/h. Motored bogie employs single tread brake rigging and trailer bogie employs both the double disk brake rigging and the single tread brake rigging and WTR246G also employs parking brake device. A body vibration detector (BVD) applying accelerometers is fitted near their bogies to prevent damage caused by derailment and collision to name a few from spreading.
Traction unit and ancillary equipments
Their traction system, WPC15A, employing Insulated Gate Bipolar Transistor
(IGBT) controls two PG (Pulse Generator) sensor-less asynchronous motors,
WMT106A, with a power output of 270kW. Their traction system featuring
2 level Variable Frequency Drive (VFD) is integrated with the auxiliary
power supply unit with a power output of 75kVA, synchronizing with other
auxiliary power supply units throughout the overall train set to achieve
higher redundancy while in failure. Class kumoha227-0 vehicles are equipped
with a motor driven rotary-screw air compressor, WMH3098-WRC1600, under
their floor and a single arm current pickup, WPS28E, on their roof and
prepared to be fitted with another current pickup on their roof. They feature
the electric commanding brake with regenerative brake and holding brake.
Their transmission system employs duplex system featuring the system configuration
based on international standard and the standard data transmission protocol,
Train Realtime Data Protocol (TRDP), for the system standardization and
higher quality.
Accommodation
Seating accommodation consists of the mixture of longitudinal seating having the wind screen and the stanchion at the end of the passenger saloon and 2+2 abreast switchable transverse seating with 910mm seating pitch and Fold-down auxiliary seating provided next to the doorway in order to increase standing capacity during peak hours. Their seating is covered with red fabric. Their overhead luggage rack is 1765mm high compared with 223 series with 1850mm for easier handling. The air conditioning duct is fitted above the ceiling in order to improve interior design and the outlets of cool air are slit shape. Hanging straps with larger looped handle in green near priority seating area and orange at the other for easier hold and perceptibility compared with former 223 series are fitted throughout their body. The quantity of hanging strap is one and a half times as many as 223 series. The passenger saloons feature LED lighting. LED displays for providing passenger information are fitted above the doorways in zigzags. End vehicles, class kumoha226, are equipped with a universal access toilet employing the vacuum toilet system. End vehicles, class kumoha227 and kumoha226, are also equipped with a wheel chair space. The control desk of the driver's cab is equipped with three liquid crystal displays showing the speed meter, the pressure gauge, and the other information instead of analogue indicators. Information showing on each display is switchable.
Additional delivery
Thirty-one 3-car sets and fourteen 2-car sets were additionally delivered
over the period from March 2015 until February for only 227 series to provide
the services during datetime and weekends and commence the service on the
Kabe line. Furthermore, twenty-two 3-car sets and twenty-six 2-car sets
were also delivered in order to displace old EMU vehicles used in Hiroshima
region over the period from April 2018 and February 2019.
Operations
227-0 series are now used on the rapid and ordinary services of the Sanyo line between Fukuyama and Shin-Yamaguchi, the Kabe line and the Kure line. |
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