The final delivery of this series of wagons came in 1925 with the arrival from the Metropolitan Carriage & Wagon Co., Ltd. of Saltley Works, Birmingham but were note used until paid for the following year, stored at St. John's until this time.  Of these twelve wagons, some of which were the longest surviving and represent the sole surviving member of the series, M.78 was restored by the Supporters' Association in 1998.  M.71 (together with M.61 and M.66) had its sides and ends removed and was fitted with tanks from road tankers for the short-lived oil train traffic.