Variable-gauge bogie of AVE-120 001 set.
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This bogie is based upon the BRAVA system developed by CAF.
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As on RD system of Talgo (and unlike SUW2000 of PKP), wheels are unloaded when changing gauges, hence these little shoes which slide on supporting rails.
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Photo by Diego Roque (bpt@tranvia.org) (Acknowledgements), from Tranvia.org 
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Posting and comment by P.L.Guillemin (plguillemin@yahoo.fr)