The modernisation of the Metropolitan line, the final part of the New Works programme which had not been completed or scrapped, was finally given the go-ahead by the BTC in 1956. This consisted of electrification from Rickmansworth to Amersham and Chesham, some station reconstruction and quadruplication, and replacement of the rolling stock. Steam locomotives were fully withdrawn from the underground network on 9 September 1961. By the end of 1962, new A stock trains had replaced all the pre-war stock on the Metropolitan line.