The use of a third rail in rail transport modelling is a technique that was once applied, in order to facilitate easier wiring.
Early O gauge track pieces. All metal, with a small fibre insulating washer beneath each central rail chair.
Railway modelling or model railroading is a hobby in which rail transport systems are modelled at a reduced scale.
Third rail (model rail)
…The use of a third rail in rail transport modelling is a technique that was once applied, in order to facilitate easier wiring. Pre-war train sets from makers such as Hornby were almost entirely O scale…
One of the smallest (Z scale, 1:220) placed on the buffer bar of one of the larger (live steam, 1:8) model locomotives
HO scale (1:87) model of a North American center cab switcher shown with a pencil for scale
Z scale (1:220) scene of a 2-6-0 steam locomotive being turned. A scratch-built Russell snow plow is parked on a stub (Val Ease Central Railroad).
A railway modelling club in Calais