# Tobu 500 series

The Tobu 500 series (東武500系, Tōbu 500-kei), branded Revaty (リバティ), is an electric multiple unit (EMU) train type operated by the private railway operator Tobu Railway on limited express services in Japan since 21 April 2017. As of September 2020, 11 three-car sets (33 vehicles in total) have been built by Kawasaki Heavy Industries.

## Design

The trains were built by Kawasaki Heavy Industries, with exterior and interior styling overseen by Japanese industrial designer Ken Okuyama. The driving cabs at each end of the three-car trainsets includes an automatically extending gangway connection to allow trains to be coupled or split en route.
* The gangway connection between two coupled units
* Two units being coupled en route in May 2017
* Interior of the driving cab
* Interior of the right-hand side cab
The trains have active suspension, a first for trains operated by Tobu, and use permanent-magnet synchronous motor (PMSM) traction motors.

### Naming

The trains are branded Revaty (リバティ), a name derived from the English words "Variety" and "Liberty".

## Operations

As of 21 April 2017, the trains are used on the following services.
| Service name | Between | Line(s) used |
| Revaty Kegon | Asakusa - Tobu Nikko | Tobu Skytree Line - Tobu Nikko Line |
| Revaty Kinu | Asakusa - Shin-Fujiwara | Tobu Skytree Line - Tobu Nikko Line - Tobu Kinugawa Line |
| Revaty Aizu | Asakusa - Aizu-Tajima | Tobu Skytree Line - Tobu Nikko Line - Tobu Kinugawa Line - Yagan Railway Aizu Kinugawa Line - Aizu Railway Aizu Line |
| Revaty Ryomo | Asakusa - Tatebayashi | Tobu Skytree Line - Tobu Isesaki Line |
| Skytree Liner | Asakusa - Kasukabe | Tobu Skytree Line |
| Urban Park Liner | Asakusa - Omiya/Nodashi | Tobu Skytree Line - Tobu Urban Park Line |
| Urban Park Liner | Omiya - Unga | Tobu Urban Park Line |

## Exterior

The exterior livery consists of "champagne beige" with "forest green" and "future blue" (Tobu's corporate colour) highlights around the windows.

## Formation

The fleet of three-car sets are formed as follows, with two driving motor ("M") cars and a non-powered trailer ("T") intermediate car.
| Designation | Mc1 | T | Mc2 |
| Numbering | MoHa 50x-1 | SaHa 50x-2 | MoHa 50x-3 |
| Capacity (seated/total) | 56/112 | 87/136 | 56/112 |
| Weight (t) | 40.5 | 35.1 | 40.4 |
The two motored cars each have one single-arm pantograph.

## Interior

Each three-car set has a seating capacity of 161 passengers. Seat pitch is 1,000 mm (39 in). Interior lighting is LED lighting. Wi-Fi and at-seat AC power sockets are provided.
The automated on-board passenger announcements use the voice of TV presenter Tomomi Kuno [ja].
* Passenger saloon interior
* Wheelchair space
* The connecting gangway between units

### Toilet facilities

Each trainset includes a universal access toilet, western-style toilet, and urinal, located in the centre car.
* The universal-access toilet
* Interior of the universal-access toilet
* The standard western-style toilet
* The men's urinal

## History

Tobu Railway officially announced initial details of the new trains on 22 April 2015. In April 2016, Tobu announced that the trains would be used on through services between Asakusa in Tokyo and Aizu-Tajima in Fukushima Prefecture via the Yagan Railway and Aizu Railway Aizu Line from spring 2017.
The first three sets, 501 to 503, were delivered from the Kawasaki Heavy Industries factory in Kobe in December 2016.
The 500 series "Revaty" trains were a recipient of the 2018 Laurel Prize from the Japan Railfan Club.
Sets 509, 510, and 511 were delivered in September 2020. These sets' delivery was the final working on the Chichibu Railway Mikajiri Line before its closure.