In 1967 (50 years ago) at the start of electrification there was some competition for Euston to Coventry times, 93 miles I believe, which some were managing just under the hour. Notional 100mph limit but up to 110mph was "tolerated". Vacuum braked stock.
Another little competition at the time was to hit 100mph by Willesden Junction going down.
In the late 90s I routinely did Eus-Cov non stop in 59 mins on the famed 2115 (86+MkIIs)
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Just think what it could have been like had 140mph operation (with in-cab signalling) on the WCML happened along with 4 tracking all the way from Rugby to Stafford, a Stafford bypass, grade separation for Colwich (or complete new re-alignment), rebuilt Crewe to allow 125mph through the station area. Maybe we wouldn't need HS2? Massively cheaper too. Even with 125mph operation, removal of the Stafford, Crewe and Colwich constraints must have a significant impact?
4 tracking all the way Rugby to Stafford was never proposed.
A rebuilt Crewe at 125 saves about half a minute max.
The proposed linespeed profile for 140mph from Wembley to Crewe included many restrictions sub 140 to deal with the curves and some tunnels - Bushey, Watford, Berko, Linslade, Wolverton, Weedon, Kilsby, Rugby, Atherstone to name a few. From memory 140 saved about 5 mins Euston to Crewe non stop.
The main constraint is fast line capacity South of Rugby, and sortin Colwich / Stafford etc doesn't help that.