 When this system was abandoned, Motor cars all became Second class, except for six which were retained for special duties (AM), and the double-ended single units (ABM).On 10 February 1935, 18M and 44M were damaged in a serious collision at Croydon, and the bodies scrapped; the frames and electrical equipment was retained, and they were rebuilt with new bodies of the current Tait design, being renumbered 442M and 443M.Motor cars 1, 8, 15, 46, 65, and 78, were built as ACM units, and retained as First class AM cars until single-class suburban travel was introduced in 1958.