Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 18 Class WT locomotives were built at Derby Works in England to the design of George Ivatt between 1946 and 1950. They were numbered 1 10 and 50 57. They were a tank engine version of the NCC Class W moguls. A tank engine did not require turning at termini and the LMS had produced a series of successful 2-6-4Ts. Like the LMS Fairburn 2-6-4T built at the same time, they had a hopper bunker and absence of plating ahead of the cylinders. They were based on the LMS Fowler 2-6-4T by Sir Henry Fowler. In December 1962 locomotive No.50 received a boiler from one of the ex-NCC 2-6-0 tender locomotives, the boiler and firebox being overhauled and repaired at Derby.