Bagnall's built 0-4-0ST "Judy" to special order so that it could pass under a low bridge at Par Harbour, With small wheels, a low footplate, and the cab floor low down in the frames, the cab roof and saddle tank are no higher than a five-plank wagon. This is demonstrated when "Judy" visited the Bristol Harbour Railway and was coupled to a former War Department wagon which is used as to hold their coal.