Thanks for the replies. If I go to Moorfields, can you see the Northern and Wirrall lines on the same level/platforms or are they in seperate locations. As I am spending about an hour at Sandhills I am more interested in the trains I won't see there (ie) the Wirrall line.
Which platforms do they run from ?
Thanks again !
All Wirral Line trains stop at platform 3 at Moorfields, which is a separate platform, lower down than than the two Northern Line platforms. The Wirral loop line runs at a greater depth than the Northern Line link tunnels.
You can't really miss the Wirral Line platform, as it is clearly signed as "Wirral Line" throughout the station. If you keep going down all escalators till you get to the bottom, then you will be there.
Also as Liverpool Central is currently closed, there are extra staff there to assist in almost all parts of the underground station.
Just bear in mind that if you are spending a long time at any of the Merseyrail underground stations, then it can start to feel a little cool after a while, even if it's warm outside. Particularly it gets breezy due to the trains constantly pushing air through the tunnels.
Personally I'd prefer to sit at an outside station, but as others have said none of them will let you bag all Wirral Line trains in one sitting. You'd have to go to two outside stations minimum, one on the northern branch of the Wirral line, and one on the southern branch.