Jon,
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I thought steel was the better connector. Guy argued with me that you need extra feeders for steel because it was a poor conductor. So thanks.
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I prefer steel.? It has better adhesion. Nickle silver is slippery.? Fortunately, I live is So Cal, where humidity is not a problem.? Also there is more wheel rail contact in O scale, so while the rail needs to be kept clean, its not as fussy.
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John
