Sadly when there was a plane option instead - that always tended to be way cheaper (London to Scotland for example).
Personally I'd subsidise it more on less used routes just to push people out of cars more, sadly London commuter routes have kinda hit the wall in capacity ad legacy limitations of the old layout/station platform lengths, rail gauge, bridge heights etc of which much was planned for in an era 100 years ago.
Sadly when there was a plane option instead - that always tended to be way cheaper (London to Scotland for example).
Personally I'd subsidise it more on less used routes just to push people out of cars more, sadly London commuter routes have kinda hit the wall in capacity ad legacy limitations of the old layout/station platform lengths, rail gauge, bridge heights etc of which much was planned for in an era 100 years ago.