In the 1967 "National Traction Plan" of British Railways, which spelled the end for hundreds of old, non standard or unsuccessful diesel and electric locomotives and diesel multiple units, the '103' DMU was classified as being of a non standard body design although quite acceptable mechanically. The design had the unique LMS side profile so doors were quite different from the Mk1 profile used on other DMUs, the aluminiun window units were also unusual; however the design had standard AEC 150 hp engines and R15 transmission units and 'blue square' electrical systems. Withdrawls began in the early 1970s although as the years passed the National Traction Plan designation became increasingly meaningless and more '103' vehicles fell victim to the withdrawl of surplus DMU vehicles in the late 1970's. The design was eliminated from the North Wales Coast lines in 1981 and the final survivors were withdrawn from Machynlleth depot on the 'Cambrian' lines. The last power car being withdrawn in December 1982 and the last trailor in February 1983. The '103' DMU had lasted nearly 25 years - longer than any other design of vehicle designated "non standard" in 1967.

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