Hi Sean - another interesting query from you! My 'home line' that I grew up using (born near Brighton) - tho my familiarity dates more from the 1970s. I thought I had the 1966-67 Southern Region Timetable book, but it turns out it is the 'South Western Division'* only section - that is trains from / to Waterloo broadly, not Victoria - anyway - others have given you good timetable info.
Some context for you might be worth watching the short film made by British Transport Films (British Railways in house film unit) dated 1965 or 1964 called 'Down to Sussex' - it's a tourist promotional film really, so not so many trains - this is on you tube at
Don't be fooled by the fancy dining car service in the first few minutes however, that is the Brighton Belle all Pullman train (Brown and Cream carriages) - another train showing the Electric Units at about minute 10 (crossing the main viaduct on the line).
It would have been rare to see trains with engines and hauled carriages (electric or diesel let alone steam) on the route even before 1968, apart from freight trains or special services.
By 1968 the then new '4 Cig' trains electric multiple unit trains (and their equivalents with buffest card '4 Big') would I think be much more common on the line - internally these trains had a few compartments - with a corridor along side - mostly or maybe all 1st class compartments, and open saloons. Each 'unit of train' was 4 carriages but they could be joined up into 8 or 12 car trains, which passengers and staff could then walk through the length of them. Older trains would have been used on some services however.
The electric service operates using a 3rd electrified rail that the trains pick up the electricity from (as opposed to overhead wires).
*
EDIT - checked this more thoroughly and it does contain a summary of principal services to the south coast - so not full stopping patterns but it does give the following departures on weekday mornings from Brighton to London
Timetable: 18 April 1966 to 11 June 1967
Brighton Depart: 07.02 Victoria Arrive: 08.09
Brighton Depart: 07.13 Victoria Arrive: 08.24
Brighton Depart: 07.36 Victoria Arrive: 08.44
Brighton Depart: 07.58 Victoria Arrive: 09.02
Brighton Depart: 08.06 Victoria Arrive: 09.15
Brighton Depart: 08.36 Victoria Arrive: 09.42
Brighton Depart: 09.25 Victoria Arrive: 10.25 (Brighton Belle - 5 or 10 car Pullman trains - but Pullman does not mean sleeping car in the UK)
Brighton Depart: 09.30 Victoria Arrive: 10.32
I suspect the earlier trains mentioned above were not considered 'Principal services' so are not listed in my 1966 summary timetable, but I very much expect they ran too.
Note: there are also trains to London Bridge station in London that do not go through Clapham Jct
Catering: Some of these trains have what is listed as a '
Miniature Buffet' (snacks, bar drinks, tea, coffee minerals)
others have a
'Buffet Car' (hot dishes to order. Light refreshments - bar drinks, tea, coffee minerals)
The
Brighton Belle Pullman has 'A la carte meals served at every seat, light refreshments and drinks'
Let me know if you need to know catering for a particular train.