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The added weight is primarly for better tracking. Since there is a lot of pull on it from the rest of the cars behind it there's a lot of pull working on it in the corners so it makes it easier to keep it on track when natural forces want to pull it off the track. The added weight is because there is no extra weight from the engine. The example of what is happening is put a string on a curve on a peice and pull it towards the end. The string wil naturally want to pull into a straight line. Much like what a string of cars would want to do, The added weight also helps when going over turnouts. <br />Andrew
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