- Data centers are being tested directly beneath active railway tracks in Tokyo
- Constant vibrations and heat fluctuations create challenging conditions for server stability.
- Modular infrastructure enables building-free deployment of large-scale data centers
A Japanese consortium is testing whether data centers can operate in one of the least forgiving urban environments: directly beneath active railway tracks in Tokyo.
The pilot project, which will begin in June 2026, involves installing a small-scale modular data center beneath an elevated section of the Oimachi line.
This places servers directly within an environment defined by constant vibration, fluctuating temperatures, and sustained 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 provision, connectivity and system design.
Measurements will focus on sound insulation, thermal insulation, vibration insulation and cooling efficiency within the confined structure beneath the tracks.
These 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 power access, driving interest in smaller, modular deployments.
Midsize facilities are 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 test integrates servers, cooling equipment and power supply in a compact cabinet, allowing deployment without constructing large-scale buildings.
This approach aims to reduce installation complexity and enable faster deployment in restricted environments where traditional installations are difficult to build.
An advantage of this proposed configuration is the use of pre-existing infrastructure, as the use of existing rail corridors introduces a potential avenue to expand digital capacity without the acquisition of new land.
This is very important because land constraints are increasingly difficult to ignore in Tokyo, where property prices increased by 69% in 2024, according to Mordor Intelligence.
The city is already home to 132 operational data centers, and at least 18 more are currently under construction, adding further pressure on available space.
The project configuration also has access to pre-existing fiber optic networks installed along Tokyu railway lines.
These high-capacity connections could allow underground data centers to be integrated directly into established communication backbones, reducing the need for additional network construction.
The consortium is considering broader deployment across 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 to other sections of the Tokyu railway network.
Via Prtimes
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