West Ruislip.

Travel Here's some really excellent reporting from The Londonist about one of the capital's "parliamentary" train services:

"There's a 'ghost train' service running in and out of London Paddington. It is rarely advertised and attracts few riders. It runs to and from West Ruislip, once a day, on weekdays only.

"This 'parliamentary' train is a little-known service kept open only to stop the lengthy process of shutting the line down completely due to lack of use. This means that if you ever have a need to get between Paddington and Ruislip at somepoint mid-morning, there is a train service that just might be suited to you."

I'm sure there must be someone who "collects" these things. And gets annoyed when the route is changed and they have to go back again.