 In the 1921 recoding they became 156M and 157M respectively, and over the following years other cars 155M and 158M-164M were planned to be converted ex AC, BC or ABC cars.These all entered service as single-ended M-coded vehicles in the period 1921-1922.The first to be converted to double-ended operation was 162M in 1926, followed by 159M, 163M and 164M in 1929 (around the same time 157M was recoded), 155M in 1932 and 158M in 1937, each recoded to ABM as they were released from the workshops.