The LU Central line trains from Epping to West Ruislip, (c. 55Km) take about 85 minutes end to end. On this and some of the other journeys mentioned in the thread, the volume of end-to-end journeys made mean that that lack of toilet facilities are not necessarily the issue that the journey times might appear to make them.Good point. I'm based near the Manchester Metrolink tram system, end-to-end journey times on there of up to an hour (or thereabouts), and no toilets on any of the trams, and scarcely any at any of the stations.
