# Tokyu 2000 series

The Tokyu 2000 series (東急2000系, Tōkyū 2000-kei), reclassified Tokyu 9020 series (東急9020系, Tōkyū 9020-kei) from 2019, is a Japanese commuter electric multiple unit (EMU) train type operated by Tokyu Corporation in the Tokyo area since 1992. They were used on Tokyu Den-en-toshi Line and Tokyo Metro Hanzomon Line inter-running services from 1992 until 2018, as well as the Tokyu Oimachi Line since 2018. Three 10-car sets were built by Tokyu Car Corporation between 1992 and 1993, all of which were shortened to 5-car sets by March 2019.

## Operations

These sets are used on the Tokyu Oimachi Line. Originally, they were used on Tokyu Den-en-toshi Line and Tokyo Metro Hanzomon Line inter-running services; they were not capable of running through onto the Tobu Skytree Line, and had circular "K" stickers on the centre front cab window to indicate this.

## Design

Based on the earlier Tokyu 9000 series EMU design, two sets were introduced in 1992, followed by a third in 1993. The first two sets were delivered with roller blind destination indicators, whereas the third set was delivered from new with 3-colour LED destination indicators. All three sets have since been modified with full-colour LED destination indicators.

## Formations
### Den-en-toshi Line 10-car sets

The 10-car sets consisted of six motored (M) cars and four unpowered trailer (T) cars, formed as shown below, with car 1 at the Shibuya end.
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Designation | Tc2 | M2 | M1 | T2 | M2 | M1 | T1 | M2 | M1 | Tc1 |
| Numbering | 2000 | 2250 | 2200 | 2700 | 2350 | 2300 | 2800 | 2450 | 2400 | 2100 |
| Weight (t) | 27.8 | 33.1 | 34.7 | 26.2 | 33.1 | 34.7 | 27.2 | 33.1 | 34.7 | 27.8 |
| Capacity (total) | 130 | 144 | 144 | 144 | 144 | 144 | 144 | 144 | 144 | 130 |
Cars 3, 6, and 9 were each fitted with one lozenge type pantograph. Cars 3 and 9 had wheelchair spaces.

### Oimachi Line 5-car sets

The 5-car sets consist of three motored cars and two trailer cars, formed as shown below, with car 1 at the Oimachi end.
| Car No. | 1 | 2 | 3 | 4 | 5 |
| Designation | Tc2 | M | M2 | M1 | Tc1 |
| Numbering | 9020 | 9220 | 9320 | 9420 | 9120 |
Car 4 is fitted with two single-arm pantographs, and car 2 is fitted with one.

## Interior

Passenger accommodation consists of longitudinal bench seating throughout.
* Interior view
* Interior view of car 3, showing the wheelchair space

## History

The first two sets entered service on the Den-en-toshi Line in September 1992, with a third following in 1993.

### Refurbishment, Oimachi Line transfer, and reclassification to 9020 series

In March 2018, set 2103 (excluding its T2 and T1 cars) underwent a programme of refurbishment. The refurbishment included the implementation of a new traction system as well as an updated interior with new seating moquette and additional wheelchair spaces. In addition, the original lozenge pantographs were replaced with single-arm pantographs.
Later that year, the 2000 series fleet was withdrawn from Den-en-toshi Line services and shortened to 5-car sets for use on the Oimachi Line beginning with set 2103. By February 2019, 2000 series set 2102 had also been transferred; both sets were reclassified "9020 series" and respectively numbered 9022 and 9023. Set 2101 was transferred to the Oimachi Line in March 2019; it was subsequently renumbered 9021.
The fifteen cars deemed surplus as a result of the fleet's transfer were scrapped in 2018.

### Future replacement

In May 2024, Tokyu Railway announced that as part of its 2024 capital investment plan, the 9020 series, together with the 9000 series, is scheduled to be replaced with a new fleet of rolling stock based on the 6020 series.