It's even more crazy here in the UK.
I can buy a ticket from Blackpool To London for, say, £238 (Changing at Preston) ... A ticket on the same train (Glasgow - London via Preston ) but from Lancaster costs £156 A ticket from Blackpool to Lancaster (Change at Preston) is £14. So In thoery I can buy a ticket From Blackpool To Lancaster, and a Ticket from Lancaster To London for £170, saving £68. I then get on the train at Blackpool, travel to Preston, Get off the train at Preston, and wait for the Glasgow-London train, Get on the train at Preston, only to be told, that I don't have a valid ticket for the journey because I didn't board at Lancaster!
Or the time I went from Blackpool To London, using one of the many journey splitting services, it was cheaper to travel Blackpool to Birmingham, and Birmingham to London ... ON THE SAME TRAIN!! Yet because I didn't get off the train at Birmingham, and get back on it, getting my ticket "Stamped" my second ticket wasn't valid for the second part of the journey.
In the UK public transport system, the lunatics have truly taken over the asylum!!!