Fascinating reply, Grahame, many thanks for that in depth response.
My pleasure - the question offered a really good opportunity to look at the wider issues of our southern section.
In some ways Wiltshire is a single county - the council is always talking "Salisbury, Chippenham and Trowbridge" and there are firm economic and cultural links, but on the other hand the south of the plain section (Salisbury, Amesbury, Tidworth etc) look far more to the Southampton/Solent area as their economic area, whereas west and north Wilts look towards greater Bristol and Bath, and Royal Wootton Bassett, Cricklade, etc, look toward Swindon. And that Warminster - Salisbury section is almost crossing the border; I've seen it on borders in Europe - Dutch / {Belgian|German} border where trains run quite frequently up to places like Venlo and Roosendaal, but the international train to Monchengladbach or Antwerpen goes much less often. From Kaldenkirchen (I recall), and from Essen (I'm sure), there are again many more trains.
Gosh - you've got me going again ... there is extra justification for bringing the Salisbury - Westbury leg up to twice an hour now that our
LEP» (future enterprise area) is SWLEP (Swindon and Wiltshire LEP) and indeed for the more local services that serve Dilton Marsh and other potential moderate to far future aspirations to carry on through to Swindon as part of that service from Westbury.
Great to see the Transwilts plans come to fruition, lets hope the service thrives and expands further.
Isn't it just!
... you get some idea from the deep nature of what I've been writing (and what I have written is just an overview) of just how MUCH work has gone into all the TransWilts elements to make sure that it really will work well - as a line and as an engine for the economy too.