The '74/'75 timetable shows two trains to Bracknell per hour from Waterloo Mon - Sat. Sunday shows one per hour with an additional from Ascot.
From Waterloo:
Mon - Sat: Typically a faster one at xx:36 taking 45 minutes calling at Feltham, Staines, and Ascot (carried on to Reading) and a slower one at xx:54 taking 57 minutes calling at Richmond, Feltham, Staines, Egham, Virginia Water, Longcross, Sunningdale and Ascot (carried on to Reading).
Sunday: Typically One train per hour from Waterloo at xx:54 taking 57 minutes calling at Richmond, Feltham, Staines, Egham, Virginia Water, Longcross, Sunningdale and Ascot (carried on to Reading). One train per hour from Ascot at xx:16 which connects from the xx:24 Guildford service ex Waterloo arr Ascot at xx:10.
From Bracknell:
Mon - Sat: Typically 'Slow' at xx:50 taking 57 minutes and 'Fast' at xx:20 and taking 47 minutes. Same calling points as above.
Sunday: Typically one train to Waterloo at xx:20 taking 57 minutes and calling at the 'slow' train pattern above. Also an xx:50 to Ascot connecting with the xx:00 departure to Waterloo which started from Guildford (same calling points as the 'slow' train above. (also 57 minutes).