Which requires Northern Powerhouse Rail, unless you're willing to close Whiston, Rainhill*, St Helens Jn**, Lea Green, Earlestown, Newton-le-Willows, Patricroft and Eccles to allow Chat Moss to only be for fast trains.
* This could never happen, given the historical connection it'd hit the Press just as hard as images of a certain viaduct in the Yorkshire Dales did. It's not an important station in particular, but it would be the heart of a campaign.
** You might get away with keeping one, probably this one or Earlestown.