Don't normal train toilets flush straight out onto the tracks?
Recall a sign saying please don't flush while train is in the station.
Should also mention I've not been on a train for many a year.
In no way is this an attempt at a diagnosis, but maybe something that will help encourage you to go see your doctor ASAP.
When I was diagnosed with type 1 diabetes over 30 years ago one of the key indicators was night time peeing. I was 30 at the time so age was not a reason for it.
When your...