sentences:  The five locomotives of the initial batch were successful enough in working munitions trains to Newhaven at the beginning of World War I for the Government to grant permission for the construction of five more of the class, eventually constructed at the end of 1916.In October 1913 Billinton ordered the design of an enlarged version of the J class tank, with the trailing truck replaced by a bogie.This 4-6-4 or Baltic wheel arrangement was intended to be more stable at speed than the 4-6-2 arrangement of the original design.