I'm currently reading the RCTS books on the BR standard locomotives. In the section about the Standard Cl5 4-6-0's there is a one sentence statement: 'Poultney reversing gear was installed on 73105-9 and 73120-4 in place of the normal BR hand screw type.' Nothing else about this is written. I've never before heard of Poultney reversing gear nor this variation in design on the standards. I've tried to find out more information but the only reference I have so far found is that E C Poultney, with Locomotive Valve Gears Ltd and Albert Reidinger obtained patent No.660,035 in October 1951 for 'Improvements relating to reversing gear for steam locomotives.' Guess a visit to the Patent Office is called for but, before I do, does anybody know anything about this equipment? Was it later removed or did it remain on the locos until withdrawal? The 10 locos were from the standard Walschaerts build and spent their entire life allocated in Scotland.