Now(well for the past 2 and a half years really!) that these express services have been axed and highly unlikely to ever return, it means me hunting around again the future timetables for when there are rare diverted services running "fast" along the original Great Western Mainline to/from/via Bristol Temple Meads due to engineering work on the Berks & Hants. These services are very very rare. I remember there being such services on a weekend or two back in 2011, and then the next ones were not until 2018! There were some back in 2019 if I recall, though these were on weekdays only and I wasn't able to travel on those due to working.
Those expresses nearly always caught up with the preceeding South Wales service at Reading, if not by Swindon approaching Rushey Platt.
I remember booking myself (pre-Covid) onto one of the 1Hxx services from Bristol Parkway to connect to a Eurostar, and we crawled through Reading P10, as TVSC refused to hold the late preceding train looped in P11 for us to fly through…
Unlike 1E01 (the 05:40 off Edinburgh, calling only at Newcastle) that has half the ECML looped for it, generally no service holds that status on the GWML, sadly.
Ironically, this has been re-emulated on the 387 diagrams from BPW having horrendous amounts of stop-starts, as the faster acceleration acts against the lower line-speed available to them in places, especially approaching Swindon - where being 3-5 minutes early approaching Wootton Bassett Junction is not uncommon.
These days, of course, the timetable is much more regular and seasonal holiday traffic is not accounted for with such provisions of extra trains (probably because such volumes no longer exist/prefer to lug it down the M5/A38).
I'd like to see more 'proper' express options from the west country to London, but having traveled recently on the fastest available Exeter-Taunton-Reading services I do not see the demand.
I did a (scheduled) Reading-Exeter non-stop back in HST days - it felt like an absolute age, as long non-stops up the B&H with not many discerning features really does seem longer than say York-London etc.
One of the advantages of skipping Reading if time savings are to be made is it now has a 95mph through speed (ignoring delays) if going towards Swindon, with enough platforms to enable overtaking. I imagine it wasn't worth skipping there so much before the major remodelling, when it was just 50mph and very congested anyway.
Out of the 7-8 times I’ve skipped my home station Reading, maybe 2 or 3 of those runs were clear through?
1U28 19:12 PAD-BRI (in years gone by, first stop SWI) was one that did usually get a clear run, and it absolutely hooned it through the platform at 95!
1G23/25/27/29 (PAD-CNM during the evening peak) are first stop Didcot from Paddington, as well as the new fast Oxfords - “flyers” - which are 1W33/34, 1M92 and 1W04.
In the morning peak, 1A09 06:55 TAU-PAD runs non-stop from Chippenham-London, which I’ve also taken from Bristol a few times.
1A06 06:20 WSM-PAD and 1L08 06:28 SWA-PAD are also fast from SWI.
There also used to be a morning service from DID, that was all-stops (or maybe semi-fast?) to Paddington, but passed Reading via P15 at around 7am, if my memory serves me correctly!
