It appears that a little known international legal convention requires that all signal boxes modeled in scales of 4mm and above should have a detailed interior.
An even less well known sub clause allows exemptions from using the kits intended for the Wills and Ratio signal boxes under exceptional circumstances.
This applies even when said signal box is:
- at the back of the layout
- has no interior lighting
- has window panes smaller than any other building on the layout.
I thank m'learned friend Iain Robinson for bringing this to my attention.
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