That's a great idea... in theory. But while heritage rolling stock may be fast and comfy, it doesn't comply with a thousand regulations that have been introduced in recent decades.
- The doors may be 1 cm narrower than "regulations" specify, . . . so they'd be deemed non compliant.
- There may be insufficient grab bars, . . . . . so they'd be deemed non compliant.
- They may contain plastic which would be toxic if an idiot applied a ciggie lighter to it, so they'd be deemed non compliant.
- The connections between carriages may allow a certifiable moron to hurt their little finger, so they'd be deemed non compliant
- The airon systems may not be able to cool or heat the carriage in once in a century conditions, so they'd be deemed non compliant
There are hundreds of bureaucrats employed at taxpayers expense to enforce these nanny state regulations in almost every aspect of our lives.
I agree that their job appears to be entirely dedicated to making life unnecesarily difficult and unpleasant for everyone. But they are very self righteous about it and fines and/or court action are regularly thrown at any person or company that dares to defy them.