You ask how the extra hoards of passengers get there and the main thing is they do..They have been increasing in numbers big time since I've been commuting from here (22 years)..
Now all we need to do is find out where they are all coming from ;-)
My personal thoughts are as follows:
- Shoppenhangers car park is reasonably full by 7am and totally full by 7.30am. Most vehicles, in my experience, are coming from the A404 hence why they use this carpark rather than the forecourt or Silco.
- Given that if you live north of Marlow you'd need your head examined to be using
FGW▸ as opposed to Chiltern one must assume that Marlow is the northern most reach of Maidenhead station.
- From conversations I've heard on the platform some also drive down from Henley area as parking is better than Twyford.
- In summary, if the branch line services were better then less people would be driving to the station.
Edit note: Quote marks fixed, for clarity. CfN.