I grew up playing with Bachmann HO gauge trains. The Spectrum ones were better quality than regular Bachmann. Ironic.
My fiancee wants kids when we get married and we move in. Kids love playing, and I think trains (toy or model) are fascinating because they're using imagination with all trains and a certain technical knowledge as well. Pun very much intended, but why are toy trains a great way to teach STEAM subjects?
The model trains are beautiful, the old toy "tinplate" trains are delightful, real trains are my favorite although sadly underutilized here in the States for passenger service.
Not modeling right now but I have been building a tiny stash of antique A.C. Gilbert American Flyer trains for future kids. These were bought for their play value not for their collectibility. American Flyer made good trains for the 1940s and 50s and I think that most children have not changed too terribly much. Space so I bought a small collection of straight and curved track, some freight cars, and two old steam engines.
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It's not working yet but I can fix it up. A C Gilbert trains are not rare.
The scale was S gauge, a nominal 1:64 which makes them the same size as Matchbox cars and a lot of toys and miniatures. Ideally since these are quite rugged and it's easy to scratch build rolling stock in this scale, should Mrs Gerontius bring forth Puerus et Puella G. as she is hoping, they will be able to add rail to the LEGO/building block/Lincoln Logs/cardboard box villages most kids inevitably build if given time, toys, and Imagination.
Letting kids play with a 70-year-old electric appliance has its attendant dangers, putting valuable antique trains out for kids to play with is probably risky for one's collection, and I don't look forward to stubbing a toe on the route of the Dropleaf and Eastern at the interchange with the Carpet Central (route of The
Baseboard Limited). Still cool though.
Also you can scratch build or 3d print trains in this scale in case I get kid requests for dieselization or electric power. Not sure how an SD70MAC would handle tinplate curves but it's at least worth experimenting.
In the meantime, I and my future bride have not been playing with the electric trains but we do go out exploring on a light rail line with modern electric trams. Tram cars are awesome and I dare say more fun than riding in automobiles.