The works completed so far haven’t had much effect. With Sprinter trains only able to do 75mph, and 185s restricted to 80 (but has been pointed out a blanket 75mph is in place from Bolton to Chorley anyway for whatever reason), the works has been basically a minor resignalling project.
When trains capable of doing the higher speeds arrive then that is when the enhancement will be noticed.
The only immediate improvement that has had a direct input into improving performance has been the resignalling of Agecroft to Salford.
Prior to this any train which required the platform (Up & Down Bolton) at salford Crescent was signalled Down to a red, which due to TOC defensive driving meant slowing down to 15mph before the signal would be able to clear. This signal was also on a right hand bend.
Now, with the addition of an extra signal, a 75mph approach is permitted as the signal controlling access into the platform has been moved so it is visible at the end of the straight, and can now signal trains straight in. With the slightly higher speed into the platform of 30mph, and a PSR of 50mph just before, it means trains can brake for the station and not the signal.