Follow the link for the revised timetable for the 58/59 applicable from 23 April.

Link: 58 bus timetable 23rd April

In respect of the detail of what has changed, it is rather technical as it is addressing punctuality issues.  Specifically in the morning peak, some journeys from Middleton to Rochdale have been split at Oldham.  This allows a second bus to start in Oldham on time heading to Rochdale – extra time has been allowed in another bus schedule to allow this to happen.  Furthermore, an extra trip has been added at 0850 from Shaw to Rochdale which can then work the 0930 return trip which is currently operated by the late running 0815 from Middleton.

In the afternoon peak (approx. 1445 to 1745) an extra 5 minutes has been added to the running time and when the buses reach Rochdale, they drop back 25 minutes to ensure on time departure, for example the 1558 arrival works the 1625 back to Middleton.

I did say it was technical but hopefully should provide a more reliable service.