I have been researching a change of headcode for a couple of my class 33s. The era would be mid to late sixties and one headcode that seems to crop up an awful lot in my books (especially on services seemingly heading towards Bournemouth and Weymouth) is C2. When did the use of 91, 92, 93 etc become common use on the Bournemouth line services and also can anyone tell me a bit about the use of headcode C2.   Seperately I have an image of one Crompton (same timeframe as above) between Bo