Nick Ridgway
In my OO days, I had 3 SR green coaches, 3 blood-and-custard coaches, three maroon coaches and three blue/grey coaches – a brake, a buffet and a composite in each. By swapping the sides I could make four six-coach rakes provided no more than 12 vehicles were on view at once! That’s cheating, and that’s the principle involved in creating the illusions that our models convey.
In theatre, one suspends disbelief; that is the principle at work on models.