Hornby R30273 SR, N15 'King Arthur Class', 4-6-0, 741 'Joyous Gard': Big Four Centenary Collection - Era 3The N15 Class, introduced in 1918 from a design by Robert Urie, was also known as the King Arthur Class, being named after persons and places associated with the legend of King Arthur and the Round Table. This class of two cylinder 4 6 0 passenger steam locomotives proved to be one of the most successful during the post grouping era of 1928 1948, with 74 locomotives being built during this time. The whole class was built in a total of six batches,