Perhaps a chance for "Four tracks, now" to become 4 platforms NOW
The business case for an extra passenger platform at Westbury was included in the analysis for the proposed Devizes Gateway station, but the case failed. Loading the cost of the works needed onto the new business generated by a new station on one of the lines was unliely to work. However, the case may well be made if you take a wider look at the benefits it will bring as all services move up to being at least hourly.
Imagine Westbury ... as part of a regional strategy - a pattern of cross platform connections, with Metro trains arriving before and leaving after expresses.
In each hour, south west bound trains:1. Swindon to Weymouth Platform 0 00:01 - 00:10
2. Cardiff to Portsmouth Platform 1 00:05 - 00:06
3. Bristol to Salisbury Platform 0 00:25 - 00:34
4. London to Exeter Platform 1 00:29 - 00:30
5. London to Westbury Platform 2 00:20
6. Bristol to Radstock Platform 1 00:48 - 00:50
In each hour, north east bound trains:2. Portsmouth to Cardiff Platform 2 00:10 - 00:12
1. Weymouth to Swindon Platform 3 00:07 - 00:16
6. Radstock to Bristol Platform 3 00:20 - 00:25
5. Westbury to London Platform 2 00:32
3. Salisbury to Bristol Platform 3 00:40 - 00:52
4. Exeter to London Platform 2 00:45 - 00:47
1. All stations Swindon to Weymouth (maybe from Oxford)
2. Main Line Express - Cardiff to Portsmouth
3. All stations Bristol to Salibury - may continue to London (Waterloo) or Romsey
4. Paddington, Reading, Westbury, Castle Cary and further stations west
5. London, Reading, main stations to Newbury, all stations to Westbury
6. All stations except FFD and AVF to
WSB» , then Frome High St and Radstock
I am aware of a massive number of other considerations and had considered some of those as best as I can. For example, the London to Exeter overtakes the London to Westbury at Newbury, and the Swindon trains (to and from) pass each other in a dynamic loop north of Melksham.