Switch puzzle

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Looks like a by-pass switch on a funicular (Cable up the mountain) Barney Barnier

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To: "3N&W Mailing List" <nw-mailing-list at nwhs.org>
Subject: Switch puzzle
Date: Sun, 3 Mar 2013 12:12:57 -0500
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This image has appeared repeatedly in a switch manufacturer's ad in various railroad trade journals.  It appears to offer three different routes through it.  Can anyone explain where such a switch would be used?

Gordon Hamilton
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