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Paulie; <br />We produce the helix kit advertised in MR and MRP. The kit has over 80 feet of track per main and we have had no problem with two or more HO engines pulling 25 to 30 car trains. Of course, downgrade is easy. There was a good thread about the affect of physics on model trains. Additionally, check out the Kalmbach books on Track Planning and Realistic Design by Mr. Armstrong. They are a great resource and will help with understanding the dynamics of model railroading. Good luck.
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