A Concrete Frame in a Field
The Former Toyokawa Telephone Loading Coil Tower (旧豊川電話装荷線輪用櫓, Kyū Toyokawa Denwa Sōka Senrin-yō Yagura) is a reinforced concrete structure of the early Shōwa period at Noguchicho in Toyokawa City, Aichi Prefecture, entered on the national register as a Registered Tangible Cultural Property on 5 December 2007. It is six metres tall and covers about ten square metres of ground.
Nothing about it looks like heritage. There is no roof, no door, no ornament. A bare concrete frame rises out of farmland, and drivers pass it every day without registering what it is.
What it is, according to the Agency for Cultural Affairs, is a rare survivor from the first long-distance telephone cable network built in Japan. The tower carried loading coils at its top, and it was put up to a standard design issued by the Ministry of Communications. The Agency records it as standing roughly four kilometres west of the former Toyokawa telephone repeater station.
What a Loading Coil Tower Was For
Voice signals travelling along a cable lose strength with distance. The engineering answer adopted in the 1920s was to insert coils, called loading coils, at regular intervals along the line to compensate for that attenuation. In 1928 a loaded long-distance cable opened between Tokyo and Kobe, the first intercity telephone link of its kind in Japan.
Loaded cable was laid in two ways, underground and overhead. Where the run was overhead, the coils needed a platform, and towers like this one were built between repeater stations at a basic spacing of 1830 metres. Toyokawa City's local history survey notes that the stretches around the Toyokawa repeater station carried an unusually high proportion of overhead cable, which is why the towers cluster in this district. Two more of the same type survive in neighbouring Toyohashi City.
After the war, unloaded cable took over and the loaded circuits were cut up and reassigned to local traffic. The Toyokawa repeater station was closed in 1952 and the coils were taken down. What is left at Noguchicho is the frame that held them, standing in a field.
The registration criterion applied was the one for structures that set a standard in design, and the Former Toyokawa Telephone Loading Coil Tower carries registration number 23-0261 from the 57th round of registrations. In the Agency's classification it is filed not as a building but as a structure of another kind, under the heading of everyday life and infrastructure. That classification is worth noticing: this is a piece of telecommunications plant that has been admitted to the same register as farmhouses and shrine halls.
What to Look at on the Ground
Six metres is not tall, but in flat farmland with nothing beside it the Former Toyokawa Telephone Loading Coil Tower reads as much larger than its footprint suggests. Ten square metres is about the area of a small bedroom. The whole structure is a support, and every part of it is doing structural work.
Look for what is missing. The coils that gave the tower its purpose came off after the repeater station closed in 1952, so the platform at the top is empty. So are the anchor points where cable once ran in and out. Reading an industrial ruin means reading absences, and here the absences are the entire operational history of the thing.
The standard design is the other point of interest. This tower was not designed for Toyokawa. The Ministry of Communications issued a pattern and it was built repeatedly along the route, which is why the two survivors in Toyohashi look like siblings. Standardisation of this kind is ordinary in modern infrastructure and rare in what usually gets protected as cultural property.
About four kilometres east, the former Toyokawa telephone repeater station survives as the head office of a manufacturing company and is separately registered, along with its warehouse. The tower and the station were parts of one system, and seeing both in an afternoon makes the network legible in a way neither does alone.
Visiting the Former Toyokawa Telephone Loading Coil Tower
This is not a visitor facility. There is no gate, no staff, no admission charge and no opening hours, because there is nothing to open. The tower stands on farmland at 11 Kaizu, Noguchicho, and Toyokawa City's cultural property list records it as privately owned, so the land around it should be treated as private property and not entered.
Viewing and photographing the structure from the adjoining public road is the practical way to see it. From the roadside the full height is visible and there is no obstruction.
Yahata Station on the JR Iida Line is the nearest approach, roughly fifteen minutes on foot. Drivers should note there is no parking provision of any kind at the site, and stopping on the road beside farmland is inconsiderate at working times of year.
Because a privately owned structure in open farmland can be affected by changes on the ground, travellers making a special trip may want to confirm the current situation with the Cultural Properties Section of the Toyokawa City Board of Education Lifelong Learning Division on 0533-88-8035 before setting out.
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Q&A
- What was the Former Toyokawa Telephone Loading Coil Tower used for?
- It held loading coils at its top. These coils compensated for the weakening of voice signals along long-distance telephone cable. The tower belonged to the network opened in 1928 between Tokyo and Kobe, the first loaded long-distance telephone cable route in Japan.
- Can you visit the Former Toyokawa Telephone Loading Coil Tower, and is there an entry fee?
- There is no fee and no facility. The structure stands in farmland recorded as privately owned, so it should be viewed from the adjoining public road rather than approached across the field. There are no opening hours.
- How big is the Former Toyokawa Telephone Loading Coil Tower?
- Six metres high, with a footprint of about ten square metres, built in reinforced concrete. The Agency for Cultural Affairs registers it as a single structure.
- How do you reach the Former Toyokawa Telephone Loading Coil Tower?
- The address is 11 Kaizu, Noguchicho, Toyokawa City. Yahata Station on the JR Iida Line is about fifteen minutes away on foot. There is no parking at the site.
- Are there other towers like the Former Toyokawa Telephone Loading Coil Tower?
- Two of the same type survive in neighbouring Toyohashi City. All were built to a standard design issued by the Ministry of Communications, so they closely resemble one another. The former Toyokawa repeater station about four kilometres east is also registered and is now a company head office.
Basic Information
| Name | Former Toyokawa Telephone Loading Coil Tower (旧豊川電話装荷線輪用櫓) |
|---|---|
| Location | 11 Kaizu, Noguchicho, Toyokawa City, Aichi Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 5 December 2007 |
| Quantity | 1 structure |
| Dimensions | Reinforced concrete; height 6 metres, area 10 square metres |
| Owner | Privately owned according to the Toyokawa City cultural property list; the Agency for Cultural Affairs database leaves the owner field blank |
| Public Access | No visitor facility and no admission charge; viewable from the adjoining public road only, as the surrounding land is private |
References
- National Cultural Properties Database, Agency for Cultural Affairs: Former Toyokawa Telephone Loading Coil Tower
- https://kunishitei.bunka.go.jp/heritage/detail/101/00006422
- Cultural Heritage Online: Former Toyokawa Telephone Loading Coil Tower
- https://bunka.nii.ac.jp/heritages/detail/153025
- Aichi Prefecture, Cultural Property Navi Aichi: Former Toyokawa Telephone Loading Coil Tower
- https://www.pref.aichi.jp/kyoiku/bunka/bunkazainavi/yukei/kenzoubutu/kunitouroku/1280.html
- Toyokawa City: List of Designated and Registered Cultural Properties (PDF, as of 23 April 2026)
- https://www.city.toyokawa.lg.jp/material/files/group/47/shiteibunkazaiichiran20260423.pdf
- Toyokawa Historical Walks, Toyokawa City (reproduced by the Mito Chamber of Commerce): Former Toyokawa Telephone Loading Coil Tower
- https://mito.or.jp/mito-intro/toyokawahistory/5mountain/4-5-13
Last verified: 2026.09.01