The Fort William-Mallaig Jacobite steam specials are currently suspended until at least 26th July, after a visit from Office of Rail & Road (ORR) Inspectors found "issues of concern" with West Coast Railways' (WCRC) operation of hinged door carriages. Details are a bit sparse!
https://www.railadvent.co.uk/2023/07...-from-orr.html
Tony