Shunter George "Bulldog" Mullins critically eyes stock fitted with Sprat & Winkle couplings. His shunter's pole is legendary among shunters for being rather crude!   The following notes on Sprat & Winkle couplings seemed to generate some interest when first posted over on gwr.org.uk, so perhaps they are of of use to someone here also. I have taken the opportunity to take some new and better photos for illustration.     Hooked   Although the latest