There seem to be some combinations in TFL's single fares finder which say no fares available, for example reading NR to Waterloo NR.
From looking at maps I belive it is possible to make this journey without passing through any intermediate ticket barriers and without leaving the PAYG area by changing at ealing broadway, earls court, West brompton and Clapham junction.
So what happens if you do this? is there some default rule when there are no fares in the database? are their "secret" fares for obscure combinations? will the passenger get charged for two incomplete journeys?
From looking at maps I belive it is possible to make this journey without passing through any intermediate ticket barriers and without leaving the PAYG area by changing at ealing broadway, earls court, West brompton and Clapham junction.
So what happens if you do this? is there some default rule when there are no fares in the database? are their "secret" fares for obscure combinations? will the passenger get charged for two incomplete journeys?