My delightful A History of the British Steam Tram has in its final volume 9, Sharp Stewart's single driver monorail engine for the Lisbon Tramways. While I can't copy from the book, here is a link to an engraving of a trial held in Epping Forest of all places. https://commons.wikimedia.org/wiki/File:Experiencias_Larmanjat_Epping_-_GazetaCF_1225_1939.jpg  This could deal with the issue of driving a railway through narrow medieval streets. You only need a single rail in the middle, but I suppose o
    • Craftsmanship/clever
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