They are replacing a railway that provides a fast efficient service to Manchester with a more expensive, slower alternative that will take 3 years to complete. By which time those people who need to get to work in Man will have already chosen an alternative form of transport. This in a town where we have had three new bus stations, all in different places, and where the train station, which is a mile from the town centre, up a hill, and half the local population is seperated from the town by a by-pass which allows the considerably richer population of Saddleworth to get home 5 minutes quicker.
Oldham is some kind of how-not-to-do-it town and transport planners sand-box, and has been jeffed about by succesive suits for at least 30 years.
Sticking a Metro link in will make precisely no difference at all, will cost more and make the journey to Man slower.