The difference with a train is that it is far more likely to be repaired to a high standard of safety. Sadly though the papers will make a meal out of this - "Scotrail making their passengers travel in written off carriages". Send em a 230 I say !.
Doubt the papers even know of 478s history bar a photo of it stranded in flood water. Was never really publicised that the insurers had "written it off". More likely to be "Scotrail roll out newly refurbished trains". As most people will see a shiny new paint job, new seats, wifi etc as a "new train". I remember people thought the 4 314 units that received the Saltire branding along with refurbished interiors were brand new trains!