This plaque on Main Street in Milngavie on the outskirts of Glasgow marks the site of George Bennie's remarkable, but experimental, Railplane.
Invented in the 1920s, this was a zeppelin-shaped carriage suspended from an overhead track and powered by propellers. The aim was to create a two-tier railway with slower freight trains using the ground level track, with faster passenger railplanes flying above them.
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