The problem with most O gauge is the exposed gearing. LGB and most G scale use gearboxes that are sealed or fairly well sealed against water getting in there. The plastic and paint is designed to get wet. Running O gauge outdoors in nice weather is ok, or in the snow with the track already cleared off and not snowing while running might be ok. The British run O outdoors quite a bit, not sure if they run in the rain. I do know the gearing on UK tinplate steamers are inside the frame, not outboard where it can get both wet or pickup debris off the layout. My Bassett Lowke O gauge live steam mogul looks good running on a snowy layout btw.
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