Western Region in the late sixties/early seventies as it reminds me of watching the trains go by out of the windows at school when living near Reading.
Currently building a 7mm layout based on Evesham Station "between the bridges" which is a hybrid of the old Midland Station layout and the GWR buildings in the garage with a return loop in the garden based around 1970(ish) so that I can run blue and green diesels.