A Nederlandse Spoorwegen (Dutch NS) ticket machine in 1:1 scale. This should be adjusted to your desired scale (for example 1:87 scale would be 1.1% the size of 1:1 scale). I also recommend using supports to elevate this off this print bed so it doesn't stick. I have only tried this on a resin (SLA/DLP) printer and I think the details are too small for a filament (FDM) printer. Painting with brushes in HO (1:87 scale) is difficult, might be easier to mask the sections off and airbrush. I intend to make a lighted version of this in the future. This would involve a hollow body with openings for the LCD screen in the signage which could be produced on a color 2d printer.
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