Golborne, Wigan (WCML)
Leyland West / Midge Hall (Ormskirk-Preston line)
Glazebury / Leigh Parkway (Chat Moss line where it crosses the A574)
As PR1Berske also has noted Coppull, on the WCML, and Standish, a few miles further south towards Wigan.
You would need to restore at least a single slow line south of Balshaw Lane Jc to the old Standish Jc.
Coppull and Standish have both grown considerably in recent years, 8000 and 13000 respectively. Both could be served by Liverpool Wigan Preston trains.
Golborne is twice their size - about 24,000. It could be served by a new stopping service Preston, Leyland, Euxton, Coppull, Standish, WiganNW, Golborne, Glazebury (Leigh Parkway & Culcheth), Eccles, Manchester stations.
Culcheth and Glazebury population is 11000, and Leigh 42000. All these are prime commuter territory for Manchester. A decent public transport option is badly needed to relieve the overloaded M61, M62 and A580 which all have severe congestion at peak times.
Slight inconvenience for Virgin on the WCML and the indolence of Network Rail and DfT should not be allowed to block all these towns from having decent rail facilities. The alternative bus services are desperately slow or non-existent, on the crowded roads of south Lancashire.