Hod, remember "Rule 1", which states "it's YOUR layout"! You can run what you want........
Many here will be sticklers for as much accuracy as possible, while others like to just play trains! A past layout of mine had a narrow-gauge (009) line of the MGWR; not a thing like this ever existed!
Had the trial of this contraption been successful, it is likely that it would have operated on the Dublin - Cork line, so laminates would indeed be the order of the day.
I did a double-take at your model - I didn't realise it was LEGO! Now, that's a SUPERB job if ever I saw one.
Incidentally, for anyone interested, I found a large amount of material relating to Bullied's sidekick John Click in the NRM in York when I was over there delving into something else entirely, some years ago.
Had it survived into the 1960s, it would have ended up black and hauling Cravens!