This relates to a particular brief moment in the long and baffling history of the 517 Class.   Frankly, I cannot keep a grip on the subject and have had to produce my own aide memoire in an attempt to do so!   During the period 1895-1905 a number of class members repaired or rebuilt at Wolverhampton were given extended smoke boxes with wing plates.   These were subsequently removed, presumably on the next re-boilering, if not before, save in the case of 567, which was sold to the Bishop's
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