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[quote user="mudchicken"] Last time I looked, wyes worked pretty well and don't gobble up so much real estate.[;)][;)][;)] [/quote] The purpose of a street roundabout is to prevent right of way conflicts by forcing all traffic to move one circular direction.  For railroads, if the purpose is to avoid at grade diamond crossings, it'd be a lot cheaper to construct an elevated grade separation than some mile wide circle of tracks.  And yes, a lot less real estate.
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