N class locomotives were initially painted in an unlined dark grey livery with white lettering and numbering. This Maunsell grey livery was introduced by the SECR as a wartime economy measure. After Grouping in 1923, the Southern Railway replaced the different liveries of the constituent companies with a standard sage green livery (the colour was that previously used by Robert Urie on the LSWR) with black and white lining, primrose yellow numbering and "Southern" on the tender. This livery was first applied to No. 825.