The world’s 20 largest tunnel construction projects account for $538.11bn of investment, spanning rail, roads, water infrastructure and energy. Yet the balance of spending is becoming increasingly one-sided. Railway tunnels account for 14 of the 20 projects and $383.17bn of total investment, or just over 71%, leaving every other sector competing for a much smaller share of the market.
Japan’s $72.27bn Tokyo to Osaka Maglev Railway Line: Tokyo to Nagoya Section tops the ranking, followed by the UK’s $65.99bn Hinkley Point C Nuclear Power Station electricity transmission tunnels. China’s $57.7bn Gwadar to Kashgar Railway Line and $47.19bn Sichuan-Tibet Railway: Ya’an-Nyingchi Section, together with the UK’s $45.43bn High Speed 2 Rail Link, complete the top five and reinforce the scale of investment flowing into strategic rail infrastructure.
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The concentration becomes even more striking further down the ranking. Metro schemes in Australia and Vietnam sit alongside intercity rail links in France, Malaysia and India, while major road, water and energy tunnels appear only occasionally. The $30bn Countywide Stormwater Conveyance Tunnels in the US, the $20.1bn Sacramento to San Joaquin River Delta Conveyance System and New Zealand’s proposed Additional Waitematā Harbour Crossing are among the few projects that break rail’s grip on the list.
The largest tunnel contracts are increasingly tied to corridor programmes that unfold over many years rather than stand-alone assets. Winning work on schemes such as High Speed 2 or the Tokyo to Osaka Maglev can lead to successive packages covering civil engineering, systems integration and specialist underground works, creating longer and more predictable order books than conventional projects.
Twelve of the 20 largest tunnel construction projects are already in execution, representing $341.29bn of investment. Much of the market’s future workload is therefore no longer theoretical. It is already moving through procurement, construction and delivery, with demand for tunnelling expertise, equipment and specialist supply chains likely to remain concentrated around a relatively small group of rail mega-programmes.
Rather than investment being spread across a broad mix of underground infrastructure, an increasing share of capital is being channelled into a handful of rail corridors whose scale is large enough to shape procurement strategies and construction capacity well beyond the tunnels themselves.
Extracted and interpreted from a GlobalData report and project-tracking data. Figures and examples cited are attributed to GlobalData’s project pipeline insights.
To access the full report, visit the GlobalData Construction Intelligence Centre: www.globaldata.com/industries/construction.
