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Keikyu N1000 series
Stainless steel (left) and aluminium (right) N1000 series sets in July 2021
In service	15 April 2002 (2002-04-15) – present
Manufacturer	Tokyu Car Corporation J-TREC Kawasaki Heavy Industries Kawasaki Railcar Mfg.
Replaced	800 series 1000 series 1500 series
Constructed	2002–
Number built	506 vehicles (85 sets)
Number in service	490 vehicles (83 sets) as of September 2023
Number scrapped	8 vehicles (1 set; accident damage)
Formation	4/6/8 cars per trainset
Operators	Keikyu
Lines served	KK Keikyu Main Line KK Keikyu Airport Line KK Keikyu Daishi Line KK Keikyu Kurihama Line KK Keikyu Zushi Line A Toei Asakusa Line KS Keisei Main Line KS Keisei Oshiage Line KS Narita Sky Access Line HS Hokuso Line
Specifications
Car body construction	Aluminium (batches 1–5) Stainless steel (batches 6 onward)
Car length	18,000 mm (59 ft 1 in)
Width	2,830 mm (9 ft 3 in)
Floor height	1,150 mm (45 in)
Doors	3 pairs per side
Maximum speed	Service: 120 km/h (75 mph) Design: 130 km/h (81 mph)
Traction system	Variable frequency (GTO/IGBT/MOSFET)
Traction motors	3-phase AC induction motor or permanent-magnet synchronous motor
Acceleration	3.5 km/(h⋅s) (2.2 mph/s)
Deceleration	Service: 4.0 km/(h⋅s) (2.5 mph/s) Emergency: 4.5 km/(h⋅s) (2.8 mph/s)
Electric system(s)	1,500 V DC (overhead catenary)
Current collector(s)	Pantograph
Braking system(s)	Electronically controlled pneumatic brakes with regenerative braking
Safety system(s)	C-ATS
Multiple working	600 series 1500 series 2100 series
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Notes/references
This train won the 65th Blue Ribbon Award in 2022. ※ Awarded for 1000-1890 series "Le Ciel"

The Keikyu N1000 series (京急新1000形, Keikyū Shin-1000-gata) is a DC electric multiple unit (EMU) train type operated by the private railway operator Keikyu on commuter services in the Tokyo area of Japan since 2002.

Overview

The N1000 series fleet first entered revenue service on 15 April 2002 as a successor to all remaining original 1000 series sets. The type garnered its designation as New 1000 series, frequently shortened to N1000 series, to distinguish it from the original 1000 series, which remained in service until 2010. Since then, "1000 series" has seen increasing use to refer to the N1000 series.

The N1000 series is Keikyu's most numerous train type, with 506 vehicles having been built as of April 2024, surpassing Keikyu's next-most numerous train type, the original 1000 series, by 150 vehicles. In March 2022, the type comprised approximately 60% of Keikyu's nearly 800-vehicle fleet.

Operations

The eight-car sets are primarily used on limited-stop "Rapid Limited Express" and "Limited Express" services on the Keikyu Main Line, including through-running services to the Toei Asakusa Line as well as the Keisei Oshiage Line, Keisei Main Line, Narita Sky Access Line, and Hokuso Line. Some of these eight-car sets are also used on the Keikyu Airport Line. Four-car sets are commonly used to form 12-car "Rapid Limited Express" and "Limited Express" services, and are also used singly on all-stations "Local" services, with occasional use on the Keikyu Daishi Line. Some 4-car sets are used to form eight-car trains for use on inter-running services to the Asakusa Line and Keisei lines. The six-car formations delivered from 2011 are generally used on all-stations "Local" services. The N1000 series sets can be used in multiple with other Keikyu EMU types, including the 600 series, 1500 series, 2000 series, and 2100 series.

Variants

Since the first set was introduced in 2002, the type has undergone a number of design improvements. Sets built from 2002 to 2006 have painted aluminium bodies, whereas sets built from 2007 onward (sets 1073 onward) have stainless steel bodies. More detailed variations are described below.

Batches 1–5

These are four- and eight-car sets manufactured by Tokyu Car Corporation and Kawasaki Heavy Industries between 2002 and 2006.

Design

Largely based on the design of the 2100 series, the N1000 series trains incorporate several differences due to the services on which they are used. These include the use of three passenger doors per side per car (as opposed to the 2100 series' two), and a commuter-oriented interior configuration.

A second batch of N1000 series sets was introduced from mid-2003, consisting of eight-car sets 1025 and 1033, and four-car sets 1409 and 1413. With the first batch of sets, four- and eight-car sets could be rearranged to form six-car trains, but this possibility was removed with this batch's four-car sets. The four-car sets also featured minor technical changes, with pantographs and power supplies being consolidated to the third car; in contrast, the first batch's four-car sets were fitted with a pantograph and power supply for each intermediate car.

Batch 3 (eight-car sets 1041 and 1049 and four-car sets 1417 and 1421), delivered in early 2005, was built with a motor car-to-trailer car ratio of 3:1 (compared to 1:1 for older sets), as well as other modifications for updated fire regulation compliance and weight reduction. Batches 4 (eight-car set 1057 and four-car sets 1425–1437) and 5 (eight-car set 1065 and four-car sets 1441 and 1445) were built with full-colour LED destination displays in place of the original roller-blind displays.

Interior

The interior incorporates a warm colour palette. Passenger accommodation consists primarily of longitudinal bucket-style seating, with transverse seating bays at car ends. Priority seating is also provided. When compared to the original 1000 series fleet, the N1000 series sets feature several accessibility improvements, such as audible door warnings, onboard passenger information displays, wheelchair spaces, and anti-slip flooring.

Beginning in 2010, priority seats were given blue moquette.

• Interior in as-built condition

Specifications

The first two N1000 series batches were fitted with Siemens SIBAS32 GTO thyristor-based variable-voltage/variable-frequency (VVVF) propulsion systems, like the preceding 2100 series fleet. These systems garnered the nickname "Do-re-mi-fa Inverter" (ドレミファインバータ) due to the distinctive ascending musical scale they produced when accelerating from a standstill. Keikyu began replacing these traction systems in 2010 with systems from domestic suppliers. Eight-car set 1033 was the last set operating with these traction systems, making its final run with its original equipment on 20 July 2021.

Batches 3–5 were fitted with IGBT (insulated-gate bipolar transistor)-based traction systems, also supplied by Siemens. These traction systems' control units were lighter and smaller than those used in earlier sets. Batch 3 also introduced lighter TH-2100BM/TH-2100BT bogies, which lacked amenities from the original TH-2100AM/TH-2100AT design such as sandboxes and yaw dampers.

Build histories

Batches 6–15

These are four-, six-, and eight-car sets manufactured by Tokyu Car Corporation (J-TREC from 2012) and Kawasaki Heavy Industries between 2007 and 2015.

External and technical changes

These sets were built with significant bodywork and system updates over previous batches, some of which would be firsts for the N1000 series and Keikyu's history. These changes include the use of stainless steel bodies with film wrapping used for body colouring (earlier sets used painted aluminium); the discontinuation of front-end wiper covers; and domestically supplied traction systems from Mitsubishi, Toyo Denki, and Toshiba. The new bodies are approximately 40 millimetres (2 in) narrower than their aluminium-bodied counterparts. Four-car sets were built with motor cars throughout whilst eight-car sets preserved the motor car-to-trailer car ratio of 3:1.

Batch 10 introduced improved front-end emergency exits and onboard train management systems.

The sets have garnered the nickname Ginsen (銀千, lit. 'silver thousand') for their red and silver colouring.

Internal changes

From batch 6, the transverse seat bays at the ends of cars were replaced with longitudinal bench seats, the seat partitions were recoloured beige, and the driver's position was raised by 150 mm (6 in). Batch 7 introduced yellow warning tape around the door interiors; batch 10 introduced visual door warnings and LCD information displays; and batch 11 introduced internal LED lighting (set 1313 only), following trials with older trainsets from December 2009.

• Interior
• Interior with wheelchair/stroller space at left
• Priority seating
• LED info display (batches 6–9)
• LCD info display (batches 10–15)
• Driver's cab

Build histories

1000-1800 series

Two new 1000-1800 series four-car sets (1801 and 1805) were delivered from J-TREC in February 2016. These two sets differ from earlier variants in having centre gangways on the cab ends as well as a vinyl-based red and ivory livery. These two sets entered revenue service on 4 March 2016.

A third set, 1809, was delivered ahead of the 16th batch on 30 September 2016.

Batches 16–19

These are six- and eight-car sets manufactured by J-TREC and Kawasaki Heavy Industries between 2016 and 2019.

External changes

While they inherit the stainless-steel bodies used with the N1000 series fleet since 2007, the 16th-batch sets carry a film-wrapped livery akin to that of the 1000-1800 series sets. For the 17th batch of sets, film-wrapped liveries were discontinued in favour of painted liveries. Keikyu states that these sets are the first privately operated, stainless steel-bodied sets to incorporate full-surface painting on a large scale in the Kanto region.

LED lighting is used throughout, and the 16th-batch sets are Keikyu's first to use LED headlights from new.

Internal changes

These batches incorporate a combination of longitudinal and transverse seating. Each car has two bays of transverse seating, one at each end. The longitudinal seat partitions were enlarged to reduce wind gusts and interference between seated and standing occupants. Also provided are power outlets and LCD information displays, some of which support Japanese and English, and others that support Korean and simplified Chinese.

• Interior view
• Transverse seating bay
• Power outlets

Technical changes

Beginning with batch 16, eight-car sets use Mitsubishi-developed full SiC (silicon carbide)-based traction systems with fully enclosed motors uprated to 190 kW (255 hp), compared to 155 kW (208 hp) in earlier sets.

Build histories

1000-1890 series "Le Ciel" (batches 20 and 21)

The 1000-1890 series four-car sets were manufactured from 2021. Due to replace older 1500 series trainsets, the first two sets were introduced into service from 6 May 2021 as part of batch 20. These are the first trains in the fleet to feature rotating banks of seats; they can be arranged in a longitudinal or transverse seating configuration when required. The seats are similar to those used on the 2100 series but are 10 mm (0.39 in) wider. Power sockets are also provided. They are also the first trainsets in the fleet to feature toilets; car 2 features a universal-access Western toilet, and car 3 features a men's toilet. The trains are intended for use on reserved seat "Wing" services as well as chartered event services.

Following their initial entry into service, Keikyu procured three additional 4-car sets as part of its investment plan for fiscal 2021: 1893–1895.

Following a nickname contest for the 1000-1890 series fleet held between June and July 2021, the nickname "Le Ciel" (The Sky in French) was announced for the 1000-1890 series fleet on 24 December. Four entries were given honourable mentions: "Red Rabbit", "Leap", "Sunsun", and "Kofu". From 26 March 2022, the intermediate cars of sets 1891, 1892, 1894, and 1895 were adorned with "Le Ciel" branding.

On 26 May 2022, the 1000-1890 series received the Blue Ribbon Award. Set 1893 was adorned with branding commemorating the award.

• 4-car sets x5: 1891, 1892, 1893, 1894, 1895

• "Le Ciel" branding as used with the 1000-1890 series
• Interior of a 1000-1890 series set

Batch 22

This batch was announced as part of Keikyu's investment plan for fiscal 2023, consisting of one 8-car set and one 6-car set. The first set, 6-car set 1501, was delivered from the Kawasaki Railcar Manufacturing plant on 28 July 2023 and entered service on 7 September.

Build histories

Formations

As of 26 March 2022, the fleet consists of 27 eight-car sets (numbered 1001 to 1129, 1145 to 1185, and 1201 to 1225), 24 six-car sets (numbered 1301 to 1367 and 1601 to 1667), and 31 four-car sets (numbered 1401 to 1489, 1801 to 1809, and 1891 to 1895).

8-car sets 1001 to 1033

The five eight-car (aluminium bodied) sets 1001 to 1033 are formed as follows, with four motored (M) cars and four trailer (T) cars.

The "Tpu" and "Tps" cars are each fitted with two single-arm pantographs.

8-car sets 1041 to 1065

The five eight-car (aluminium bodied) sets 1041 to 1065 are formed as follows, with six motored (M) cars and two trailer (T) cars.

The "Tpu" and "Tps" cars are each fitted with two single-arm pantographs.

8-car sets 1073 to 1185 and 1201 to 1225

The eighteen eight-car (stainless steel bodied) sets 1073 to 1185 and 1201 to 1225 are formed as follows, with six motored (M) cars and two trailer (T) cars.

The "M1u" and "M1s" cars are each fitted with two single-arm pantographs, and the "M1u'" are fitted with one pantograph.

6-car sets 1301 to 1367 and 1601 to 1667

The twenty-four six-car (stainless steel bodied) sets 1301 to 1367 and 1601 to 1667 are formed as follows, with four motored (M) cars and two trailer (T) cars.

On 1301–1367, the "M1u" cars are fitted with one single-arm pantograph, while "M1s" cars are fitted with two single-arm pantographs. On 1601–1667, the "M1u" and "M1s" cars are each fitted with two single-arm pantographs.

4-car sets 1401 and 1405

The first batch of four-car (aluminium bodied) sets, numbered 1401 and 1405, are formed as follows, with two motored (M) cars and two trailer (T) cars.

The "T1pu" and "T1ps" cars are each fitted with one single-arm pantograph.

4-car sets 1409 and 1413

The two four-car (aluminium bodied) sets 1409 and 1413 are formed as follows, with two motored (M) cars and two trailer (T) cars.

The "Tp" cars are fitted with two single-arm pantographs.

4-car sets 1417 to 1445

The eight four-car (aluminium bodied) sets 1417 to 1445 are formed as follows, with three motored (M) cars and one trailer (T) car.

The "Tp" cars are fitted with two single-arm pantographs.

4-car sets 1449 to 1489 and 1801 to 1809

The 16 four-car (stainless steel bodied) sets 1449 to 1489, 1801 to 1809, and 1891 to 1892 are formed as follows, with all cars motored (M).

The "M1u" and "M1s" cars are each fitted with one single-arm pantograph. The 18xx cars have end gangways that can be connected to form 8-car trains for through service to Asakusa and Keisei Lines.

1000-1890 series 4-car sets

The 1000-1890 series four-car sets are formed as follows, with two motored (M) cars and two trailer (T) cars. The "Muc2" car is at the Misakiguchi end.

The "Tpsv2" cars are fitted with two single-arm pantographs.

Refurbishment

On 10 May 2017, Keikyu announced that it would make investments in safety and comfort that would total approximately 21.9 billion yen. Also announced was refurbishment work for eight N1000 series cars. The work includes:

• Opening side windows
• Removal of roof-mounted exhaust fans
• Enlarged seat partitions
• Replacement of traction equipment
• Replacement of roller-blind destination indicators in favour of full-colour LED destination indicators
• Replacement of external and internal lighting with LEDs
• Replacement of above-door LED passenger information systems with liquid-crystal display systems
• Visual door warnings
• Replacement of cooling equipment

Eight-car set 1001, the first set to be treated, returned to service on 18 September 2017.

Livery variations

Haneda Airport Terminal 2

8-car sets 1025 and 1033 received a sky-blue livery to commemorate the opening of Haneda Airport Terminal 2. They carried this livery until March 2005.

Yellow Happy Train

8-car set 1057 was repainted into a special "Yellow Happy Train" livery from May 2014, for the collaboration with the private railway operator Seibu Railway. In return, Seibu repainted one of its 9000 series trainsets into Keikyu livery, known as the "Seibu Red Lucky Train". The "Yellow Happy Train" livery was originally intended to be used for about three years; however, due to its popularity, on 27 April 2017, Keikyu announced its decision to keep the livery and to also repaint the passenger doors yellow from their original silver colour.

• The "Yellow Happy Train" livery with original silver doors in March 2017
• Updated "Yellow Happy Train" livery with yellow doors in October 2020

Accidents

Set 1137 was involved in a collision with a truck on a level crossing near Kanagawa-shimmachi Station on 5 September 2019, killing the truck driver and injuring the train driver and 32 passengers. The set was substantially damaged and scrapped in March 2020.

Explanatory footnotes

1. Scrapped March 2020; accident damage
2. First Keikyu trainset to use LED interior lighting from new
3. Fitted with Toshiba-supplied PMSMs
4. "Full SiC" entails a power module combining an SiC MOSFET (metal–oxide–semiconductor field-effect transistor) with an SiC SBD (Schottky barrier diode).

References

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External links

• Keikyu N1000 series information (in Japanese)
• Kawasaki Heavy Industries product information (in Japanese)
• Siemens order information

v t e Keikyu trainsets
Current	1500 series 600 series (III) 2100 series N1000 series
Former	120 series 140 series 230 series 300/400(I)/420 and 600(I) series → 400 series (II) 500 series 700 series (I) → 600 series (II) 800 series (I) → 1000 series (I) 700 series (II) 800 series (II) 2000 series

• Electric multiple units of Japan
• Keikyu
• Train-related introductions in 2002
• Kawasaki multiple units
• 1500 V DC multiple units of Japan
• Tokyu Car multiple units
• J-TREC multiple units