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Tight curves and helices don´t mix well! A friend of mine had built a beautiful Swiss prototype layout with two of those critters - each one with Marklin´s typical minimum radius of 360mm or 14.75". They were a constant source of annoyment as any train with more than three cars bwas prone to derailment.  He finally tore down the layout in disgust! Building a helix requires a high degree of accuracy - better to stay away from them or buy a kit, if you don´t feel comfortable.
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