It should also be noted that through trains and the shortest route are always following a permitted route.
Yes but only the shortest/ through trains from origin - destination
I was looking at a flow with a very wide range of mapped routes and a faild fares check on one of the 4 RP's. involved
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You are travelling from station X to sation Y, station X is associated with RP A, Station Y is a RP.
The fare from X- Y is any permitted
However the fare from A - Y is either route reading, route not London or route London
Only the route Reading fare passes the fares check
Does that then mean that valid routes from X - Y must go through Reading and avoid London?