It became Class 123 and worked on the Western Region before being transferred to Hull in 1977 and working from Hull to Manchester Longsight Depot, near Manchester Manchester Piccadilly Nunnery Junction near Sheffield https://www.railcar.co.uk/type/class-123/ Peter
It is a Class 123 DMU - what used to run in the past - maybe before your time if you don't recognise it. There was a big fleet of different first gen DMUs running until Pacers and Sprinters made their appearance in the mid 1980s https://www.railcar.co.uk/type/