It’s possible I understand this differently to the way you meant it, but other sections of the Underground have National Rail trains running on them, and visa v

It’s possible I understand this differently to the way you meant it, but other sections of the Underground have National Rail trains running on them, and visa versa. For example, the Wimbledon Branch of the District Line : https://districtdavesforum.co.uk/thread/30753/wimbledon-branch-operational-rules https://districtdavesforum.co.uk/thread/30753/wimbledon-bran... (I know it’s a forum post but that old website is a wealth of information about the District Line).