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.

[5] The N1000 series is Keikyu's most numerous train type, with 506 vehicles having been built as of April 2024[update],[6][7] surpassing Keikyu's next-most numerous train type, the original 1000 series, by 150 vehicles.

These are four- and eight-car sets manufactured by Tokyu Car Corporation and Kawasaki Heavy Industries between 2002[12]: 71  and 2006.

These include the use of three passenger doors per side per car (as opposed to the 2100 series' two[14]), and a commuter-oriented interior configuration.

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.

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.

[8]: 2  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.

[8]: 2 Batches 3–5 were fitted with IGBT (insulated-gate bipolar transistor)-based traction systems, also supplied by Siemens.

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.

[5] These are four-, six-, and eight-car sets manufactured by Tokyu Car Corporation (J-TREC from 2012) and Kawasaki Heavy Industries between 2007[23] and 2015.

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[24]); the discontinuation of front-end wiper covers; and domestically supplied traction systems from Mitsubishi, Toyo Denki, and Toshiba.

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

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.

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

Due to replace older 1500 series trainsets, the first two sets were introduced into service from 6 May 2021 as part of batch 20.

[54] Following their initial entry into service, Keikyu procured three additional 4-car sets as part of its investment plan for fiscal 2021:[55] 1893–1895.

[57] From 26 March 2022, the intermediate cars of sets 1891, 1892, 1894, and 1895 were adorned with "Le Ciel" branding.

[63] The 18xx cars have end gangways that can be connected to form 8-car trains for through service to Asakusa and Keisei Lines.

[64]: 4 On 10 May 2017, Keikyu announced that it would make investments in safety and comfort that would total approximately 21.9 billion yen.

[67] 8-car sets 1025 and 1033 received a sky-blue livery to commemorate the opening of Haneda Airport Terminal 2.

[69] 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.