A thought from ancient history (well 50+ years ago!)
In the North east United had a range of works services to ICI works and other places. At the time fare tables were treated as being under the official secrets act, but when I acquired an old copy many years later I was surprised to find that these were mostly licensed as stage carriage, with fare tables covering the whole route.
You could, therefore, have flagged one down to go two stops down the road (2 adults + 4 child fares? ) and as this was on their license they would have to take you.
As the journeys were not in the public timetable, and usually showed the appropriate works as a destination, any such passengers would not have been popular with the conductor or the regular travellers.