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[quote]QUOTE: Originally posted by twhite On the Mountains--Bangert1's right on the money about the Key models--I have an MT-5 that is an incredible runner and puller, and has detail to salivate over. I also have an earlier KTM Balboa MT-4 that is a very handsome (and heavy) loco. Both are superb machines--I'd almost be willing to bet that on straight and level track, either one of them could match the prototype's pulling power. One thing nobody's mentioned yet, is minimum radius for these SP locomotives--being brass, they don't have the driver side-play 'give' of current plastic models, so make sure you have at least a 26" minimum radius for them to run on. They're BIG locomotives, and they like BIG curves! Tom [:D] [/quote] Tom You are correct about the radius for brass, but that is the way brass was made as you are aware. A good rule of thumb is to use at least the 26" you listed, but most brass models run better on 30" to 36". The Westside Models needed a larger radius than the older Balboa's, at least that is what I found. The club where I was operating in the seventies had 30" radius and my Westside Daylights needed more lateral play added to the main drivers to prevent climbing out of the rails. KTM might have used different specifications, as my Balboa models seemed to take the same curves OK. Who knows why??
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