The real problems stem back to the late 80's when BR▸ / Government short changed the Thames Valley services by not buying enough 165. Personally I find nothing much wrong with the 165's (toilets are the weakest link) the 166's would be better being converted to 165's
The 165 journey time on a non stop service is not much different to an HST▸
By the end of the decade problem will be solved loads of seats from Maidenhead on the 10 car Crossrail trains
I think your right about the toilets on the turbos, some can be in such a state as the one a few weeks back that stank right through the whole train on my way from Windsor to Slough.
I agree the turbo is also as fast as a HST, but people don't like the turbo as it's not built for high speed service, its more for a semi fast/stopping sort of service.
Now ChrisB reckons that a different approach to peak times should operate so that everyone gets a fair service (if i am right in saying that). That involves people travelling very early in the morning and late at night.
For that reason here's what i would do.
Between 0600 am and 0659 am these trains would run;
* 0603 Maidenhead to London Paddington, calling at; LONDON PADDINGTON ONLY (TURBO
SET▸ )
* 0613 Maidenhead to London Paddington, calling at; Slough, and London Paddington (TURBO SET)
* 0623 Maidenhead to London Paddington, calling at; LONDON PADDINGTON ONLY (ADELANTE SET) This train would then link up to form a service to Great Malvern or Worcester
* 0633 Maidenhead to London Paddington, calling at; Slough, and London Paddington (HST)
* 0643 Maidenhead to London Paddington, calling at; LONDON PADDINGTON ONLY (TURBO SET)
* 0653 Maidenhead to London Paddington, calling at; Slough and London Paddington (HST)
After 0700 am then there would be a half hourly service at these intervals at 03 and 33, calling at Slough and London Paddington (a mixture of trains could operate).
All other trains would link up to form train services from London Paddington.
In the evening the main peak time for Maidenhead commuters would start at 2000 and end at 2059, with trains running every 20 minutes calling at; Slough and London Paddington. before that time a half hourly service would operate.
Otherwise another method would be to ban non london commuters from travelling and have a dedicated only service between 0600 am and 0859 am and between 1700 and 2059. Apart from that i have run out of ideas, good old me hey