What surprises me is that (whilst there's not a lot of paths south of Bolton for additional Manchester - Blackburn services) there's been no attempt to switch the services at Blackburn into
- Manchester - Blackburn - Burnley - Colne
- Blackpool South - Preston - Blackburn - Colne
That would give Burnley/ Altricham a regular service to Manchester.
Do you mean Blackpool-Clitheroe? and Accrington for Altrincham?
Unfortunately, as you say, it would require an extra unit...
And I reckon most business travellers from the Ribble Valley would still drive down the A59.
The basic problem with the East Lancs (I speak as a new-ish resident, in a place with no station at all) is the infrastructure - Farington Jn slows you right down, as does Accy viaduct, Copy Pit has all sorts of geological issues, and I don't see much chance of improving any of them.
Frequent stops on the Colne trains, which I reckon is unavoidable (I know there were some semi-fasts in the steam era but...).
And is there still that peculiar TMO crossing beyond Nelson?
So the only way to go is better frequencies. That means a loop on the Colne line, and something drastic doing to Blackburn-Bromley Cross. I think we should be pushing for Blackburn-Bolton electrification as an add-on to the NW job - but then what about Clitheroe?