- Data centers being tested directly under active train tracks in Tokyo
- Constant vibrations and heat fluctuations create difficult conditions for server stability.
- Modular infrastructure allows deployment without building large-scale data center buildings
A Japanese consortium is testing whether data centers can operate in one of the least forgiving urban environments: directly under Tokyo’s active train tracks.
The pilot project, expected to begin in June 2026, involves installing a small-scale modular data center under an elevated section of the Oimachi Line.
This places the servers directly in an environment defined by constant vibrations, fluctuating temperatures and the sustained noise of passing trains.
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Small, modular data centers have their advantages
The demonstration experiment is designed to evaluate whether a compact infrastructure can operate under these conditions without compromising operational stability.
Participating companies include Tokyu Corporation, Tokyu Railways, It’s Communications and Tokyu Construction, each contributing to site provision, connectivity and system design.
Measurements will focus on sound insulation, thermal insulation, vibration isolation and cooling efficiency within the confined structure beneath the tracks.
Such experiments are triggered by increasing pressure on urban infrastructure as demand for low-latency data processing continues to grow.
The expansion of generative AI tools, IoT systems and 5G networks has intensified the need for distributed computing facilities located closer to users.
In dense cities like Tokyo, large-scale conventional data centers face limitations related to land availability and access to electricity, driving interest in smaller, modular deployments.
Mid-sized installations are now experiencing a compound annual growth rate of 12% through 2031 because they can be deployed more quickly in dense urban environments.
The modular system used in this trial integrates servers, cooling equipment, and power into a compact package, allowing deployment without constructing large-scale buildings.
This approach aims to reduce installation complexity and enable faster deployment in constrained environments where traditional installations are difficult to build.
One advantage of this proposed configuration is the use of pre-existing infrastructure, as using existing rail corridors introduces a potential avenue to expand digital capacity without new land acquisition.
This is very important because the land constraint is increasingly difficult to ignore in Tokyo, where property prices are up 69% in 2024, according to Mordor Intelligence.
The city already hosts 132 operational data centers, with at least 18 more currently under construction, increasing pressure on available space.
The project setup also has access to pre-existing fiber optic networks installed along Tokyu rail lines.
These high-capacity connections could allow under-track data centers to integrate directly into established communications backbones, reducing the need for additional network construction.
The consortium is considering wider deployment along the Tokyu Line network, including in areas such as Shibuya, where demand for data processing capacity remains high.
However, the technical feasibility of operating servers in such environments remains uncertain.
The result of this test will determine whether the model can be extended to other sections of the Tokyu rail network.
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