From 1925, the class was repainted in a darker olive green livery, introduced by Maunsell, with plain white lining, black borders and primrose yellow markings. In 1939, shortly after the start of the Second World War, locomotives Nos. 1413 and 1850 were painted in unlined olive green because of labour shortages. In 1941, Nos. 1821, 1825, 1847, 1878 and 1403 were run in unlined olive green with Bulleid's gilt block lettering. Labour and paint shortages during the Second World War meant that all N class locomotives were painted in plain black by 1945. In 1946, two locomotives, Nos. 1817 and 1854, were repainted in Bulleid's malachite green livery, with yellow and black lining and "Sunshine" yellow lettering.