Waterlooplein station
... that a 1975 "open tube" event at Waterlooplein station gave the citizens of Amsterdam their first look at the city's metro system?
... that a 1975 "<a href="./Doors_Open_Days" id="mwBNU" rel="mw:WikiLink" title="Doors Open Days">open tube</a>" event <i id="mwBNY">(pictured)</i> at <b id="mwBNc"><a href="./Waterlooplein_metro_station" id="mwBNg" rel="mw:WikiLink" title="Waterlooplein metro station">Waterlooplein station</a></b> gave the citizens of <a href="./Amsterdam" id="mwBNk" rel="mw:WikiLink" title="Amsterdam">Amsterdam</a> their first look at <a href="./Amsterdam_Metro" id="mwBNo" rel="mw:WikiLink" title="Amsterdam Metro">the city's metro system</a>?