Ruislip is served by three Underground lines: the Metropolitan, Piccadilly and Central lines. Ruislip and Ruislip Manor stations are on the Metropolitan and Piccadilly lines. Both stations have large car parks, and Ruislip Station has a bus station attached (serving U1, U10, H13, E7, 331, 114, 398 and 278 bus routes – see London Buses for more details). West Ruislip and South Ruislip are both on the Central line and are also served by some Chiltern Railways services. Ruislip Gardens is on the Central line only.
When there are closures on the Uxbridge branch of the Metropolitan and Piccadilly lines it is worth bearing in mind that Northwood station is on the other branch of the Metropolitan line and might still be open. Check with the TfL website.
Passengers wanting to travel to central London are usually best to use the Metropolitan line as it gets there in about 30 minutes.*