I've often wondered why Merseyrail services (at least the ones I use, Northern Line and Moorfields to Chester) always have either three or six carriages. Sometimes three is not enough, and sometimes six are almost empty. I expect there is a good reason why they can't have four at certain times of day, e.g. when the schools come out.
Also, I realise it ain't going to happen, but there are no toilets on these services. I suppose the reasoning is that no journey is longer than around an hour, but sometimes it would be handy, especially when coming from Southport and catching a connection to Chester at Moorfields, with a 12 minute wait so not long enough to use the surface toilets. Means effectively having to go two hours between Southport station and Chester station.
I noticed recently that there are out-of-service toilets on the underground level at Moorfields. I wonder if these are going to be brought back into use.
Also some stations don't have toilets, not even "on request" ones. Not good if you have a long walk home after getting off the train!
Finally, some stations are much better supplied with platform seating than others. e.g. Formby - on the north side there is just one row of three platform seats, whereas at Birkdale there are at least four rows, but no covered waiting area. The covered waiting at Formby consists of two separate rooms, each with (I think) six seats in. There is room for double that amount of seats inside, and in bad weather at peak times I'd think that would be welcomed. In hot weather these rooms are stuffy so it would be good to have extra platform seating.
It is annoying at Southport station to have to queue in the little shop to buy a Day Saver ticket, as although the staff are always helpful there is often a queue of people with complicated queries, so you have to allow an extra 10 minutes if you need a ticket that can't be purchased from the machine.
Hope it's okay resurrecting this thread. It made interesting reading.