In response to Dave Richardson's query (RN347) on the fitting of mechanical lubricator at some stage to the first order of NGG 11's numbers 51,52 & 53, I have a page which appears to have come from a Beyer Peacock catalogue, showing NG 51 fitted with the lubricator when new, it looks like a works picture. Perhaps they were removed at a later stage, I include a scan of the page, hope this solves the mystery.