- Data centers are tested directly under active railway tracks in Tokyo
- The constant vibrations and temperature fluctuations create challenging conditions for server stability
- Modular infrastructure allows deployment without building full-scale data center buildings
A Japanese consortium is testing whether data centers can function in one of the least forgiving urban environments – directly under active railway tracks in Tokyo.
The pilot project, due to begin in June 2026, involves the installation of a modular, small data center under an elevated section of the Oimachi Line.
This places servers directly in an environment defined by constant vibrations, fluctuating temperatures and persistent noise from passing trains.
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Small modular data centers have their advantages
The demonstration experiment is designed to evaluate whether 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 delivery, connectivity and system design.
Measurements will focus on sound insulation, thermal insulation, vibration insulation and cooling efficiency within the confined structure below the tracks.
Such experiments are being triggered by the increasing pressure on urban infrastructure as the demand for low-latency computing 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, conventional large-scale data centers face limitations related to land availability and power access, creating interest in smaller, modular deployments.
Medium-sized facilities are now expanding at a compound annual growth rate of 12% through 2031 as they can be deployed more quickly in dense urban environments.
The modular system used in this trial integrates servers, cooling equipment and power supply into a compact enclosure, allowing deployment without building full-scale buildings.
This approach aims to reduce installation complexity and enable faster deployment in constrained environments where traditional facilities are difficult to build.
An advantage of this proposed setup is its use of pre-existing infrastructures – as the use of existing rail corridors introduces a potential avenue for expanding digital capacity without new land acquisition.
This is very important because land constraints are becoming increasingly difficult to ignore in Tokyo, where property prices are set to increase by 69% by 2024, according to Mordor Intelligence.
The city already hosts 132 operational data centers, with at least 18 more under construction, adding further 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 enable under-track data centers to integrate directly into established communications backbones, reducing the need for additional network construction.
The consortium is considering a wider rollout along the Tokyu Line network, including 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 outcome of this test will determine whether the model can be extended across other parts of the Tokyu rail network.
Via Prtimes
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