British railway toilets on the run.?

R 66

Train arriving Lime Street Station in Liverpool.

Cee and her Odd Ball Challenge and the worth visiting inspiring challenges.

If we didn’t know better, we would think that these trains are distinctive with this front.
It could be the train’s toilet, very troublesome to use, at least while the train is moving.
How can we see if it is in use without climb out to see if the red dot in the lock is on.?

So no, probably not the toilet.