And gents' toilets with no roof over the urinals so they were exposed to the elements - common at many rural stations back in the day.
And WC cubicles with coin operated locks where you had to insert 1d in pre-decimal days (hence the phrase "spending a penny"), 1p in the early days of decimalisation, then 2p, then 4p (2x2p), then 5p. These were mostly replaced by entrance turnstiles in toilets at major stations in the 1980s and '90s, while charging for toilets at smaller stations (that is, where the facilities were still in situ and open by then) was mostly phased out around that time.
In the last few years Network Rail has abolished toilet charges at all stations managed by NR itself. Some stations managed by the train operators (for example Glasgow Queen Street) do still have them, though.
Also, at least in the late 1990s and early 2000s some London Underground stations with toilets (not that many LU stations do have them) had the traditional WC cubicle coinboxes on the external door instead of on each cubicle door. I remember that at Osterley on the Piccadilly Line about 20 to 25 years ago, and I think you had to insert a 20p coin to get in. Not sure if any Tube station toilets still have that, though.
And in the 1980s and '90s at some London suburban stations, toilets for people of one sex only as discussed in this thread:
https://www.railforums.co.uk/threads/trivia-stations-with-toilets-for-people-of-one-sex-only.241981/