 31822 and the 1930 batch was allocated the series 31876–31880.The N1 was a capable class of mixed-traffic locomotive that could operate over the Southern Railway's gauge-restricted routes and was noted by crews for its comfortable riding qualities.The class also provided Maunsell and his assistants with a precedent for other compact 3-cylinder locomotive designs and formed a mechanical template for the Southern Railway's K1 class tank engine of 1925.