Seems to me that the problem is getting worse, if thats possible in a situation like this! It's hard to deduce exactly from the info available, but......
Looks like 1E19 (1430 ex Edinburgh) stopped at Longlands Jcn and Doncaster thunderbird has been sent to rescue.
1S23 (1530 ex Kings Cross) was allowed into the area but has stopped just north of Thirsk.
1Z99 (Thunderbird) is currently moving from the down to the up and Thirsk, to run wrong line to 1E19 and rescue.
1S24 (1600 ex Kings Cross) was put on the slows at Thirsk to pass 1S23.
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Curious to know if the 18:33 Crosscountry HST to Glasgow will run as normal, or whether catching the 18:41 Grand Central HST would be a better bet to reliably get me to Sunderland.
Anything diesel (northbound) has so far been allowed to pass the area, 1S24 as noted above and a couple of Crosscountry services not long after the incident started. Not sure if this will continue, guess it depends on what repairs are required?
All southbound that were queuing behind 1E19 are being sent back to Darlington from what I can see.