 From approximately 1908 to 1922, the bogie passenger fleet had underframes and bodies extended to increase the capacity of any given train (by wasting less space with couplers and buffers).Typically, two compartments were added to one end of each carriage, with a final over-body length of 57'4½".Originally the majority of these carriages had seven compartments of 6'3 1/8", with two more added at only 6'0 11/16" each.