Can Ashley Down not be de-coupled from the Henbury element? Presumably phase 2 doesn’t need anything like the same legal and capital funding as phase 1 as it doesn’t involve building any brand new railway? Even though upgrading probably still doesn’t come cheap, and GWR will still need to be paid to operate the service.
You asked the question:
Please remind me - what is supposed to be stopping there?
I answered the question. You now seem to be disputing that answer.
Do the current proposers wish to decouple it and promote it as a standalone proposal?
Are there any other serious persons or organisations who wish to promote it as a standalone proposal?
I don't know the answer to either question. It would appear that background studies have been undertaken and that a package proposal which includes a new passenger service over an unused line serving a handful of new stations is seen as the best way forward.
Things do change. Alternative options always exist, the Metrowest documents probably discuss them.
It
might be possible to decouple it from the Henbury element, in theory. Any service which currently passes through the station
might be able to call there with some minor timetable adjustments - even long distance IEP services with selective door opening!