You didn't say which UP service this was the morning or the afternoon one
Saturday afternoon as I recall.
And what happened to the passengers from Melksham, or other places, using the service to travel to Chippenham on this service.
I understand that everyone was turfed off the heavily delayed train at Westbury or Trowbridge (I'm not sure which). It then ran empty to Swindon where it resumed the service.
I was actualy going to join at Melksham, but it was so heavily delayed that I got wind of the issue and as I had parked at Melksham station I was able to drive up to Chippenham to carry on from there with my journey to Swindon. So I took the picture of the express 153, then boarded the 125 stopper a few minutes behind it.
Local transport was provided Trowbridge - Melksham - Chippenham by
FGW▸ ; other passengers were instructed to take the Bristol train to Bath, change there, then get the London train to Chippenham and London.
To be fair to FGW, I think they were unsure at the time that they decided to turn everyone off at Westbury of Trowbridge whether the service was going to carry on at all
There is not sufficient slack in the system today which according to reports on this forum is being addressed in the new timetable, whats that, extending turnround times at destinations from 1 to 2 minutes ??
Yes, I undertand that is one of the main things. You'll also find that some en-route timings have been eased further.