I remember seeing a solitary W&C car in Selhurst some years ago, and never saw one in Wimbledon
The next "station", if you can call it a station, will be Castlebar Park which was a nice place until 1935. Now, only leave the train here if you wish to use the "shelter" to pee in. Everyone else seems to.
The GN&C also had the 501s converted to battery power, class 31 and 08 when BR took over! I personally worked the battery cars to Old Street, and someone I know took an 08 as far as Essex Road where it hit the tunnel roof! 31s ventured into the tunnel at Drayton Park but not too far in!