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The rails actually sing well before the train reaches you. Pretty eerie. I was parked in the shade having a drink, and I heard a high pitched whine, which didn't sound like it was coming from the rails, but it was. There are enough curves that the train can be right up on you quickly. Especially the southbounds.
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To Sean's and Steve's point, maybe that friction is what you hear in that ringing, hence the need to reduce that friction with grease.
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