Speed control was introduced at several stations to enhance the signalling system after World War II. This enabled a train to proceed slowly into an occupied platform without stopping in front of another before it departed, thus improving headways. The last semaphore signal, at Ealing Common, was replaced in November 1953. A control room was built at Earl's Court to centralise supervision of most of the line signalling in the 1960s, while Rayners Lane signal cabin was, and still is, the main control centre of the Rayners Lane to Uxbridge portion; shared with the Metropolitan line. 1930s automatic signalling equipment was updated in the 1970s and 1980s.
Speed control was introduced at several stations to enhance the signalling system after World War II. This enabled a train to proceed slowly into an occupied platform without stopping in front of another before i,t departed, thus improving headways. The last semaphore signal, at Ealing Common, was replaced in November 1953. A control room was built at Earl's Court to centralise supervision of most of the line signalling in the 1960s while Rayners Lane signal cabin was, and still is, the main control centre of the Rayners Lane to Uxbridge portion; shared with the Metropolitan line. 1930s automatic signalling equipment was updated in the 1970s and 1980s