Underground services in and out of central London will be closed for planned engineering works this weekend.
On Saturday 18 and Sunday 19 there will be no service between Wembley Park and Uxbridge and also Northwood on the Metropolitan Line.
There will be a fast service operating between Harrow-on-the-Hill and Amersham, and there will additional Chiltern Railways services operate between Harrow-on-the-Hill and Marylebone.
The services will be suspended while Transport for London replaces track at Preston Road and Ruislip.
On the same days there will be no service between South Harrow and Uxbridge on Piccadilly line, while track is replaced at Ruislip.