Artificial Ground Freezing

6 December 2006  •  Author(s): Dave Hindle, Director, OtB Engineering

The need to cool the environment in mass transit underground railways is becoming increasingly urgent, particularly in older networks where rising temperatures place an additional strain on systems that were never designed to cope with increasing passenger numbers. This article looks at one potential solution for cooling the deep Tube network by Artificial Ground Freezing.


Most of London’s deep Tube network was constructed during the early 20th century with even more recent lines (such as the Victoria Line built in the 1960s and the Jubilee Line a decade or so later) built with similar specifications in terms of tunnel dimensions and ventilation. Only the most recent Jubilee Line Extension (JLE) meets modern day standards and even this relies on train sizes originally specified for the line.

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