Do these station need a direct service to London? Surely connexions at Swindon, etc.
They already do... I was just thinking it might be an idea to route say 4 trains a day from Bristol > London via Westbury > Pewsey or Westbury > Melksham... It makes sense as you'll always have people wanting to use the BANES & Wiltshire Corridors...
Cant imagine there is demand for an off peak service of such a nature. Perhaps a peak Taunton - London:
Taunton, Castle Cary, Frome, Westbury, Trowbridge, Melksham, Chippenham, Swindon, Didcot, Reading, London
I do like your idea that you have suggested... Although considering there are already 2 trains within 10 minutes of each other using the Taunton > Westbury line... it might not be possible.. Perhaps an overtake on the Frome Branch or ran after the 07:19 (07:25 Perhaps) which wouldn't get to Swindon till 09:00 at least
On most routes in Germany you have regular ICE/IC▸ between major centres and RE▸ /RB trains serving local staions and giving adevrtised connections into and outof each other at major stations. Thus one has to decide is the East West to Bristol an IC or RE, if it's IC it runs Oxford possibly Bath direct. If it's RE it runs via Didcot and then stops at any Vale of White Horse new stations Swindon Chippenham via Melksahm all staions to Bath (have to work out where to reverse it).
Reverse at Westbury would be ideal for that as i suggested in my post... just whether to stop at Trowbridge before Westbury and then run fast on the return towards B-o-A or run fast to Westbury and then call at Trowbridge on the way back through...??!