Basically a gauge convertible K class with a larger boiler. In 1927 N 110 was fitted with a trailing axle booster, removed 1945.
N 110 - 139 recieved their modified front ends from 1936 to 1942.
N461, 465, 471, 474, 477, 485, 490, 491, 494, 495 sold to SAR in 1950 - 1951 becoming 750 class.
Many N's were converted to oil burning in the 1950's
N 432 has the distinction of being the last steam loco built at Newport workshops, July 25 1951.