A couple of weeks ago I made my annual trip to mid Wales including some trips on the HoWL. I was thinking about the time lost every time the train had to slow for a potential pick-up at a request stop, and a possible way of avoiding that occurred to me. As far as I know it's never been tried, and I wondered if that's correct and if so why not?
As even the smallest stations (yes, even Sugar Loaf) now have power supplies (and electronic departure boards), would it be possible to put a passenger-operated "please stop" button on the platform, which when operated could either be passed to the driver electronically, or more simply, light a trackside signal lamp say 1/2 mile before the platform.
Two possible snags occur to me:
1) malicious misuse - but I don't think that's likely on rural HoWL stations, and even if it happened, it's no worse than the current situation, with the train slowing until the driver can see the platform is empty
2) telling potential passengers they need to use it - I would suggest adding a message on the departure board "This train stops by request only - press stop button located at xxx", together with amending the existing request stop instructions.
Of course there would be a one-off cost in equipment, but I would think there would be a significant and continuing saving in fuel from the trains not having to slow down and re-accelerate at each request stop, as well a potentially a time saving.
So, does anyone know of this being tried anywhere? If so, does it work OK, or are there other snags I haven't spotted?