R3635 BR (Early) Lord Nelson Class 'Lord Rodney' No. 30863 Steam LocomotiveIn order to cope with the steadily increasing weight of express passenger traffic on the Southern Railway in the early years of Grouping, Richard Maunsell, the Chief Mechanical Officer, needed a locomotive that was more powerful than the King Arthur class, but one that would still conform to the various gauging and weight issues within the region and still be capable of hauling 500 ton trains at a speed of 55mph. The new Lord Nelson design had to fit