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The distance between trolley masts depend on the type of catenary employed and the radius of curves. North American traction lines typically had a rather simple catenary with trolley poles as a pick-up instead of pantographs, as mainly used in Europe (and today´s new streetcar lines in the US). As a rule of thumb, the distance between catenary masts must be set in such a way, that the wire rekains as close to the middle of the track as possible. More information to be found <a href="http://www.trolleyville.com/tv/school/catenary_construction/index.shtml" target="_blank">here</a>!
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