Engineering works will mean two underground lines will be partially closed again this weekend.
Major rail replacement work is being carried out during the summer months as Transport for London says it is one of the quietest times of the year for the network.
On Saturday August 2 and Sunday August 3 there will be no service on the Metropolitan line between Rayners Lane and Uxbridge while track is replaces in Ickenham.
On the same days there will be no service on the Piccadilly Line between Rayners Lane and Uxbridge.
TfL says for both lines there will be replacement buses available.
The works are part of a summer engineering project to replace old rails which will result in more than 20 days of line closures.