Rushey Platt junction between the Swindon, Marlborough & Andover Railway, 1882. The GWR track is mixed gauge, and a short length of the SMAR line is also mixed gauge - if the GWR signalman misdirected a broad gauge on to the SMAR, the train would clear the GWR main line, and the subsequent derailment would be the SMAR's problem!
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