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L'ultimo diaframma della galleria del Bözberg, in Argovia, è caduto il 29 novembre, ma il cantiere di fronte al portale di Effingen è stato reso agibile al pubblico e aperto per i festeggiamenti mercoledì. All'evento hanno partecipato il direttore dell’Ufficio federale dei trasporti, Peter Füglistaler e il landamano del cantone Argovia, Stephan Attiger.
Dal 2020 il tunnel dovrà sostituire quello attuale, non idoneo al passaggio dei semirimorchi con profilo di quattro metri. Insieme alla galleria di base del San Gottardo e quella del Monte Ceneri, il corridoio denominato appunto "quattro metri" permetterà alla Nuova trasversale ferroviaria alpina (NTFA) di alleggerire in maniera importante il traffico delle merci che attualmente attraversa le Alpi.
Secondo le stime delle FFS, grazie a questo corridoio, ogni anno verranno spostati dalla strada alla rotaia 160'000 trasporti transalpini.
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