Having seen, but sadly not ridden, the gravity train on the Ffestiniog Railway, I was inspired to make a model of it. The problem with modeling this type of train in 16mm is that on the average garden layout it will go nowhere, fast, it might trundle slowly down an incline but when it gets to a level bit or, even worse an uphill, then that's about it as far as running is concerned.
So some sort of power unit was needed, hence the anti-gravity bit.
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