Has certainly happened plenty but is certainly improving, just in relation to 197’s seeing many more 3 and 4 cars doing these services which both have 2 toilets. Once they can run the 5 cars that will be 3 toilets.TFW doing the same sending 2-car sets on 3 hour journeys to Manchester with one toilet that locks itself out.
The solution is retrofitting bioreactor toilets. They becoming proven in Europe and only require water, and empty only water onto the track with the err... compostable brickettes being emptied every two-three months.
The MK4’s have a toilet per coach (how it should be IMO).
I’m surprised that northerns 3car 195’s have just one toilet but TFW’s 3 car 197’s have the extra ‘small loo’.