Bovverboy said: ↑
Has the arrival of the ex-FGW 150s eliminated the short-forming of trains?
No. See https://www.journeycheck.com/northernrail under Train Formation Updates.
But why should there be any short-forming? Surely, a TOC sees to it that it has sufficient stock to cover the PVR, and a % extra for maintenance, no? The ex-FGW 150s should have created a stock surplus - so where are all the missing units?