Bicester North?
Yup, Bicester North. With one of the 4-Car Class 115
DMUs▸ that used to chug up and down between Banbury and Marylebone. Known for their high standard of interior fittings (compared to most other DMUs of the time), and slow acceleration - only 2 out of the 4 vehicles were powered - it's fair to say that the service on the Chiltern Line has been completely transformed since the early 80s when this picture was taken.