Thalys PBA set, seen on Thalys 9355 (Paris Nord ---> Oostende), while crossing the French-Belgian border, which stands between those 2 different kinds of 25kV-50Hz AC catenary masts...
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Wannehain-Esplechin (Frontière).
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18th June 2006. 
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P.L.Guillemin (plguillemin@yahoo.fr)