When I passed on Tuesday the alignment for the up slow was still blocked by the telephone exchange wall.
But it is not though as work is fully completed. I think what will happen the up slow line to Manchester will be
slightly realigned to the south. There are already extra track panels in for the fourth line at Huyton, see:
https://www.flickr.com/photos/127646831@N03/34231869810/in/album-72157683639340646/
David Emmott said:
How will the four tracks be used in future? I'd assumed that rather than fast/slow, the northernmost pair would be for the St Helens/Wigan line and the southern pair for Manchester. But currently the eastbound Manchester Airport service at least (which doesn't stop at Roby or Huyton) appears to be using what on that scheme would be the westbound track from Wigan. Do stopping trains use that platform at the two stations?
Also to clarify what NW Sparks as stated.
From north to south at Huyton Station.
Platform 4
Up Slow line to Prescot / St Helens AND also access to the Up Fast line to Rainhill / Manchester
Platform 3
Up Fast to Rainhill / Manchester
only
Platform 2
Down Slow from Prescot / St Helens AND also Rainhill / Manchester
Platform 1
Down Fast from Rainhill / Manchester
only.
You will note that the revised layout allows the opportunity for non stop trains (e.g. TransPennine) to pass slower traffic (e.g. Freight) at Huyton who are heading into both Liverpool and Manchester.
EG. Biomass Train put into Up Slow (Platform 4) to allow TPEx to pass on Up Fast (Platform 3), then Biomass departs to gain access at Huyton Junction to proceed on Up Fast to Rainhill.