After 20+ years of fighting the Office of Rail & Road tooth-and-nail over the matter, main-line steam railtour operator West Coast Railways has finally decided to install Central Door Locking on all its Mark 1 carriages, “following valuable feedback from our passengers and an evaluation of the operational costs associated with our Mark 2 carriages”. About bloody time.
https://westcoastrailways.co.uk/news/the-jacobite-2026-season-update
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The Jacobite: 2026 Season Update

Main Website West Coast Railways - trips throughout the UK, including the Jacobite from Fort William to Mallaig, the Scarborough Spa Express steam trips, the Dalesman Steam Trips and trips by luxury train. - Online Booking Now Available

Update from a BBC article:
«The ORR said no agreement had been reached on an exemption and the application was being reviewed.
A spokesperson said: “We note that West Coast Railways recognises the need for Central Door Locking on the Mk1 carriages it operates. However, work remains to establish the feasibility, detail, and delivery timeline of the proposed approach. ORR has not issued any exemption to the relevant requirements of the Railway Safety Regulations 1999 in relation to this matter.”»

https://www.bbc.com/news/articles/cj3786x28eeo
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Tourism worries after delay to new Harry Potter train season

The operator of the Jacobite steam train has sought a safety exemption to use old-style carriages - but this needs to be reviewed.