記錯左添，原來係用電量輕微上升、性能輕微下降，但係採購成本、維修成本大幅下降。
Donald, W.R., Gretton, J. R. & Turner, T. D., 1989. Procurement of rolling stock on the Hong Kong Mass Transit Railway. Proc Instn Mech Engrs, Vol 203, pp. 65-70— The initial contracts were let for cars with all motored axles but this was changed in later orders to trains with six motor cars and two trailer cars, an arrangement which offset a negligible increase in energy consumption and small loss of performance with significantly lower purchase and maintenance costs.
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