CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Swissinfo's[1][4] report, published 1 June 2016, covers the inauguration that day, and English Wikipedia[2][3] lists the opening as 1 June 2016 with passenger service from 11 December 2016; swissinfo's 11 December 2016 piece confirms regular service began then.The 57.09 km Gotthard Base Tunnel under the Swiss Alps was inaugurated on 1 June 2016, taking the title of world's longest railway tunnel from Japan's 53.85 km Seikan Tunnel.
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