Watarase Keikoku Railway Omama Station Main Building and

Ōmama Station: A Living Heritage of Japan's Meiji-Era Railway

Tucked away in the quiet city of Midori, Gunma Prefecture, Ōmama Station (大間々駅) stands as a remarkable witness to over a century of Japanese railway history. Built in 1911 as part of the Ashio Railway, this wooden station building and its original platform have been in continuous use since the final years of the Meiji era. Designated as a Registered Tangible Cultural Property of Japan in 2009, the station offers visitors a rare opportunity to step into a living piece of industrial heritage — one that still serves passengers every day on the scenic Watarase Keikoku Railway.

History of Ōmama Station

Ōmama Station opened on April 15, 1911, originally named Ōmama-machi Station (大間々町駅), as part of the Ashio Railway (足尾鉄道). The railway was constructed primarily to transport copper ore from the Ashio Copper Mine — one of the most significant mining operations in modern Japanese history. The first section to open ran from Shimo-Shinden to Ōmama, with the full line extending to Ashio Honzan by 1914.

The station was renamed to Ōmama Station in December 1912. In 1918, the Ashio Railway was nationalized and became part of the Japanese National Railways (JNR) Ashio Line. Following the privatization of JNR in 1987, the line briefly belonged to JR East before being transferred in 1989 to the third-sector Watarase Keikoku Railway, which operates it to this day.

Throughout these transitions — from private railway to national railway, from JR East to a community-supported local line — the station building has remained a constant presence, serving as the operational heart of the railway. Today, it functions as the headquarters and main depot of the Watarase Keikoku Railway.

Architectural Features and Cultural Significance

The station building (本屋, honya) is a single-story wooden structure with a distinctive gable roof finished in cement tiles. The main body runs on a north-south axis, with a perpendicular gable-roofed section forming the main entrance. The exterior walls are finished in white mortar, giving the building a clean, understated appearance characteristic of early 20th-century Japanese railway architecture.

What makes Ōmama Station particularly noteworthy is its scale relative to other stations on the line. Unlike the smaller stations with simple gable roofs, Ōmama Station features a more imposing hip-and-gable roof style (入母屋造, irimoya-zukuri), reflecting its importance as the principal station of the Ashio Railway. This larger, more dignified design set it apart from the humbler stations further along the route.

The downbound platform (下り線プラットホーム) retains its original length of 73 meters, with stone-built retaining walls and a wooden canopy shelter that provides cover for waiting passengers. Together, the station building and platform were registered as Tangible Cultural Properties on November 2, 2009, as part of a larger recognition of 38 railway structures along the Watarase Keikoku Line — the first time an entire railway line spanning two prefectures received such comprehensive designation in Japan.

In 2016, the station was further honored as part of the "Watarase Keikoku Railway Related Facilities Group," selected as a Japan Society of Civil Engineers Heritage of Civil Engineering.

Why Was It Designated a Cultural Property?

The designation of Ōmama Station as a Registered Tangible Cultural Property recognizes several important aspects of its heritage value. First, the station building preserves the architectural character of early Meiji-era railway construction in Japan, maintaining its original form with only modest modifications over more than a century of continuous use. The white mortar exterior and gabled wooden structure represent a clean, functional style of station architecture that has largely disappeared from Japan's modernized rail network.

Second, the station and its platform are part of a broader story of Japan's industrial modernization. The Ashio Railway was built to serve the nation's copper industry at a time when copper was a critical export commodity. The infrastructure that remains along the Watarase Keikoku Line — including bridges, tunnels, and station buildings — constitutes a remarkably intact ensemble of early 20th-century railway engineering.

Third, the fact that these structures remain actively in use as a functioning railway adds immense value. Rather than being preserved as static museum pieces, the station and platform continue to serve their original purpose, making them living cultural properties that connect the past to the present in a tangible, everyday way.

Highlights and Things to See

The Historic Station Building

Take a moment to appreciate the wooden station building itself. Its compact, well-proportioned design and white mortar walls are a fine example of utilitarian Meiji-era architecture. Inside, you will find the ticket office still in active use, along with displays about the railway's history.

Retired Railbus on Display

In front of the station, a retired WA89-series railbus — one of the original vehicles from the railway's early days as a third-sector line — is preserved for public viewing. This small diesel railcar is a beloved symbol of the Watarase Keikoku Railway.

Trolley Train "Torokko Watarase Keikoku-gō"

Ōmama Station serves as the starting and ending point for the popular "Torokko Watarase Keikoku-gō" trolley train, which runs on selected dates and offers open-air carriages with panoramic views of the Watarase Valley. The dedicated Platform 0 for this trolley train is a unique feature of the station.

The Railway Yard and Depot

As the operational headquarters of the entire railway, Ōmama Station features an extensive yard with maintenance facilities, CTC (Centralized Traffic Control) equipment, and rolling stock. Railway enthusiasts will appreciate the opportunity to see the behind-the-scenes operations of a heritage railway.

Footbridge and Platform Views

The station features a footbridge connecting the main building to Platform 2, as well as a level crossing within the station grounds. From these vantage points, you can enjoy views of the tracks stretching into the surrounding countryside.

Nearby Attractions

Ōmama Station is ideally positioned as a gateway to several wonderful attractions in the Midori City area.

Takatsudo Gorge (高津戸峡)

Just an 8-minute walk from the station, Takatsudo Gorge is praised as the "Yabakei of the Kantō Region." A 500-meter riverside walking trail runs between the red Takatsudo Bridge and the Hanetaki Bridge, offering stunning views of rock formations, including the famous "Gorilla Rock," against a backdrop of fresh greenery in spring and fiery foliage in autumn.

Nagame Yokyōjō (ながめ余興場)

A 5-minute walk from the station, this remarkable wooden theater was built in 1937 and features a revolving stage and hanamichi (walkway through the audience). Modeled after Tokyo's Kabuki-za, the theater still hosts kabuki performances and other cultural events. It is designated as a cultural property of Midori City. Every autumn, the adjacent Nagame Park hosts the Kantō Chrysanthemum Exhibition.

Ōmama Historic Townscape

The area around the station preserves the atmosphere of an Edo-period post town on the "Akagane Kaidō" (Copper Highway) leading to the Ashio Copper Mine. Stroll through streets lined with historic sake breweries such as Kondō Shuzō, traditional soy sauce makers like Oka Naosaburō Shōten, and atmospheric old merchant houses.

Conodont Museum (コノドント館)

A 10-minute walk from the station, this local museum — named after the microscopic fossils first discovered in the area — offers exhibitions on the natural history, culture, and daily life of the Midori City region.

Kami-Kanbai Station (上神梅駅)

Just one stop north on the Watarase Keikoku Line, Kami-Kanbai Station is another Registered Tangible Cultural Property, known for its beautifully preserved wooden station building from the Taishō era. It makes an excellent companion visit.

Access and Practical Information

Ōmama Station is served by the Watarase Keikoku Railway, with connections from Kiryū Station (JR Ryōmō Line) and Aioi Station (Tōbu Isesaki Line / Kiryū Line). From Tokyo, the most convenient route is to take the Tōbu Limited Express "Ryōmō" to Aioi Station, then transfer to the Watarase Keikoku Line. The journey from central Tokyo takes approximately 2 to 2.5 hours.

The station is staffed throughout the day, and ticket machines as well as a staffed ticket counter are available. Connecting tickets to JR Ryōmō Line and Tōbu Isesaki Line can also be purchased at the counter. A tourist information center is located in front of the station.

A paid parking lot is available at the station, and the area is accessible by car via the Kitatō Expressway (Ōta-Yazuka IC, approximately 20 minutes by car).