By what were the first London Underground trains pulled?

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diesel locomotives
electric locomotives
horses
Ventilation shafts at various points on the route allowed the engines to expel steam and bring fresh air into the tunnels. These shafts were sometimes hidden behind false facades, like the one in the photo (Leinster Gardens 23). The right-hand property is a fake.
Luca Biaggi
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Very interesting!
reach: rather globalhistoryhistory of technicsLondonmetrotechnologyundergroundUnited Kingdom

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