The LMS having decided on the last MR style for their own builders plates, decided to plate all locomotives as they came through the works with their new branding. All MR BUILT, MAKERS, REBUILT and BOILER NEW plates would be removed and the LMS style plate fitted of either BUILT or REBUILT (but not BOILER NEW, perhaps they considered that a a form of rebuild). It was also decided to re-plate older locomotives with the new brand back dated giving many a new collector a headache with statements such as LMS REBUILT 1914 DERBY which given the date is over a decade before the LMS exists!! Given the sheer number of plates to be patterned, made and fitted is there any wonder that patterns saying LMS BUILT or REBUILT DERBY without a date were made? personally I think these were applied to the larger classes of very much standardised locos where it would be very obvious at what level configuration it stood. It does appear that great lengths were made however to correctly plate passenger locos with their dates (based on photo's). Having said that some of the 2-6-2T locos built by the LMS had undated plates. The Derby LMS style would be disseminated to all LMS works under their control when Derby became the LMS HQ for loco affairs. Horwich, St.Rollox, Stoke etc will all mimic to their pattern makers best ability the Derby style, Crewe will for 1925 only. See Crewe plates. The LMS plate changes completely from MR style during the war only to remerge again in Derbys BR pattern.