I dont believe there is enough capacity with the 197s at the moment to even run 4 cars on the Manchesters. A few have been 4 cars but there are still a lot of 2 cars.The reason is because they're still not cleared yet. 4 car max between Shrewsbury & Manchester via Crewe because of issues with ASDO
There's 101 different reasons none of us are party to as to why they might have sent a 150 over a seemingly available 197, but like I said - it's not the kind of thing that can happen by accident, or a decision made lightly any more.
Until they stop covering on services they are not really meant to be on I dont believe we will see many 4 cars.
Yes there will be reasons why a 150 went to Manchester but its very rare now compared to a year ago, even six months ago when a lot were 150s.