By what were the first London Underground trains pulled?

steam locomotives
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 on the photo (Leinster Gardens 23). The right-hand property is a fake.
correct this question
Luca Biaggi
reach: rather globalhistoryhistory of technicsLondonmetrotechnologyundergroundUnited Kingdom
steam locomotives
diesel locomotives
electric locomotives
horses
answers
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