It appears that the DOWN line between Chippenham and Bath Spa has now reopened, with a severe speed restriction. I see that the 2000 PAD» -BRI» lost 16 minutes between the two stations and the same happened to the 2045. Trains are still being diverted in the UP direction.
21:29 Taunton - London Paddington 1A37 has been diverted via Berks and Hants lines. Road Replacement Coaches were provided for passengers wanting Chippenham and Swindon at 22:47
I am on 1A37 as we speak and so far running without incident albeit diverted.
Yesterday 1A37 was held at Twerton Tunnel where the was a reported track circuit failure from Twerton Tunnel all the way through to Thingly Junction caused by a lightening strike. We were held at the signal outside the tunnel entrance before passing the signal at danger and running 15mph into Bath Spa from there.
From someone on that train yesterday. That lightening was rather something I can tell you:
http://youtu.be/2CIhR4i0YZk