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As a curious teenager (interpret that as you will) I ran a Hornby motor underwater, just to see what happened. It ran, and a stream of bubbles emerged from the commutator/brushes. I had paid sufficient attention in Science lessons to realise that this was probably electrolysed water, i.e. hydrogen and oxygen in explosive proportions. Thankfully the experiment went no further...Well, in certain circumstances, probably only using DC rather than DCC, yes, you can try it at home.
One of the competition entries in a TV Model Railway challenge series over here included a Dutch themed layout base on historical event on a railway that ran in one of the polder areas. The layout included a flood gate, and water flooded in over the tracks and the model train (3mm scale from memory) carried on running through it![]()