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Original Text (Annotation: EPW037080 / 318623)
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                            Scaling from a picture -  
If the large crane is standing on standard gauge track (4ft 8 1/2") and the narrow gauge track is 2ft gauge (which was common for such railways), the carriageway is 34ft - 35ft wide suggesting three by 11 - 12ft carriageways or four at 8 - 9ft, which is a bit narrow even for 1931.  As it happens, on the enlargement I was using, 1mm on the picture equals 1foot!
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