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Just found this article showing inside, hope it helps,
https://www.businesstraveller.com/business-travel/2017/08/25/caledonian-sleepers-hotel-standard-coaches-ready-testing/
On Saturday 30 March I will be taking the 09:00 Inverness to Kyle.
I had heard that some scotrail units have declassified 1st class coaches.
Would anyone know about this service?