1 of 1 people found the following review helpful
BTF Volume 11. Experiment under London,
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This review is from: British Transport Films Collection Volume 11 - Experiment Under London [DVD] (DVD)
This DVD i really like - the content is what i wanted, How did they construct the Underground system - This DVD gives the two versions that were tried and found suitable for the various ground conditions that were to be encountered. Good DVD for what I wanted to know.