Classic InterCity trains have three on-board toilets for your convenience, one in each carriage. As these trains have previously been in service elsewhere in the UK, the toilets still discharge directly onto the railway track.
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As a general rule, people travelling on trains are warned not to flush the on board toilet while it's not moving. That's because most trains don't have sewage tanks, meaning anything in the toilet is dumped straight onto the tracks. So as you can imagine, if the train is stationary, it can cause huge problems.
If you are on a train, local trains sometimes do not have toilets, although most trains do (but not Underground trains). All passengers have access to these, if you want to take the risk.
The traditional method of disposing human waste from trains is to deposit the waste onto the tracks or, more often, onto nearby ground, using what is known as a hopper toilet. This ranges from a hole in the floor to a full-flush system (possibly with sterilization).
Some train drivers are changing sanitary towels in bushes by the side of the track – that's outrageous in a first world country in 2021. Others urinate or defecate into carrier bags and bottles.
If the train has a toilet then there will usually be a sign in your carriage pointing you in the direction of the nearest one. Don't assume there will always be a toilet though. Short distance commuter trains don't always have them, they tend to only be on longer distance trains.
Put your luggage only in the areas provided and do not block the aisles, seats, bike racks or wheelchair spaces. Leave toilets as clean as you find them. Please do not smoke or use E-cigarettes. Trains and enclosed platforms are a smoke free environment.