It seems that on these days there will be no way of getting from Exeter to Taunton after 19:24 and the service during the day reduced to an hourly XC▸ train from Plymouth/Penzance. While it's important to maintain a direct service from Exeter to London (and so remove the need for people to use buses), I'm not sure it's a great idea for the Exeter to Taunton service to end an hour earlier even if the service during the day has to be reduced. I note that the line between Exeter and Taunton is actually open so it seems quite unusual to close both Taunton - Castle Cary and Taunton - Highbridge at the same time unless the work is actually going to be between Taunton and Cogload Junction.
If you look at
FGW▸ 's web page "Summary of timetable changes - Saturday 14 February 2015 until Friday 20 February 2015", it shows:
Taunton - Highbridge is marked in red (24b "Saturday and Sunday ^ Services between Bristol Temple Meads and Exeter St Davids will be operating to an amended timetable. Some services will be operated by rail replacement
buses.")
Taunton - Castle Cary is marked in red (4a "Saturday and Sunday ^ The Railway line between Castle Cary and Taunton will be closed. Services be=tween London Paddington and the West of England will be operating to an amended timetable with some services diverted via an alternative route. Buses will also run between Castle Cary and Taunton").
Taunton - Exeter is not marked as affected at all. It does not even have the blue marking used for "Minor changes to train times".
Now that looks like a mistake, as the diversion of FGW services (all, after 11:00) surely counts as "Significant changes to train times". XC are running their service but truncated, so most of the day that provides some - but reduced - service to FGW passengers.
RTT» shows no FGW replacement buses to or from the south, so the last buses to Highbridge, Weston and Castle Cary cannot serve through passengers.
So is the information wrong? Or is it a major planning error? Or what?