Train feeds appear to have an additional daytime service from Swindon to Westbury at 13:19 (13:47 at
MKM» ) from May.
The 12:47 off Swindon is still down as running and there doesn't appear to be any additional inbound working, is this additional train correct and if so why does it run and where does it come from?
http://www.realtimetrains.co.uk/train/C46233/2016/05/16/advancedIt appears to appear out of thin air on platform 1 at Swindon (previous service at the platform being a Cheltenham 125) ...
From Westbury, it heads up to Parkway then forms the "Parly" over the Rhubarb loop to Bath Spa.
Very interesting ... and caught me slightly by surprise. Can't answer your "why" ... experience gives us a less sharp peak than we would have predicted, but two services 35 minutes apart in the middle of the day aren't exactly needed to relieve overcrowding.
[See edit below]Now if it was a 16:19(ish) rather than 13:19 I could give you a VERY strong business case, taking the train off the arrival from Cheltenham (16:22
WTT▸ ), and continuing it as the 17:11 Westbury to Warminster. That would give us two slightly problems; the 16:21 Westbury to Swindon would probably need retiming to 16:14 to clear Thingley in good time. And the other slight problem
with what to do with the train the currently forms that 17:11, which arrives in Westbury at 16:33 from Gloucester, and what stock to use for the 17:54 Swindon to Cheltenham Spa.
Of course, a 17:04 Westbury to 17:48 Swindon would balance things very nicely![Edit to add] ... down-thread you'll find a balancing Westbury - Swindon service, and taking this as a start to infill gaps and make use of idle time, it makes sense ... balance tips; extra 'between' round trips (and ones before start and after end of current service) make sense.