[note 3], The north portal lies in the north of the municipality of Erstfeld at an elevation of 460 metres (1,510 ft), east of the Reuss. Uplift measurement: detection of defects on pantographs in order to protect the contact line. Although Heidi had some problems with a rock collapse in the western tube between Faido and Sedrun in March 2010, the subsequent stabilization measures only interrupted tunnelling until July 2010. At first, the tunnellers tried to clear the cutterhead of the fine material by hand and back up the TBM a few centimeters. And schedules were adhered to, despite the almost unimaginable complexity of the project. Through the Rotterdam-Genoa route, the connections between these markets and those of Northern and Central Europe will be facilitated. At the moment the time saving is around 30 minutes. Today the Gotthard Base Tunnel connects Erstfeld and Bodio at a length of 57 kilometers. Since December 2016, journey times between the German-speaking part of Switzerland and Ticino have been around 25–40 minutes shorter (depending on the route). In 2020, when all the infrastructure works of  both  Italian and Swiss sides will be completed,  a traffic capacity of 390 trains per day will be provided, compared with 290 trains per day actually provided , of which 170 trains along the Chiasso Pass, 90 trains along Luino Pass and 130 trains along Domodossola pass. Faster, more frequent and more convenient services as well as new and modernised rolling stock will considerably increase the transport quality on the north-south axis. In the space of only 24 hours, Gabi 2 chomped its way through no less than 56 meters of mountain – a world record for a tunnel boring machine of such dimensions. As early as 1947, engineer Eduard Gruner imagined a two-story base tunnel from Amsteg to Biasca, both rail and road, with a stop at Sedrun, to provide a faster and flatter passage through the Swiss Alps. Collisions are prevented thanks to the tunnel design with its separate tunnel tubes for each direction of travel. The overall construction time could be considerably reduced, because work on the five sections could be carried out simultaneously. Here, the tunnellers blasted huge underground stations out of the rock. Subsequently, using newly developed algorithms, a 3D model is created from the picture. The tunnel's constructor, AlpTransit Gotthard AG, originally planned to hand over the tunnel to Swiss Federal Railways (SBB CFF FFS) in operating condition in December 2016[16] but, on 4 February 2014, the handover date was changed to 5 June 2016 with the start of an 850-day opening countdown calendar on the AlpTransit homepage. Tunnels have been built through the Gotthard-Range for more than three centuries. In this method, two telescopically slidable steel half-rings are connected to form full rings inside the tunnel cross section, excavated with an overcut of about 70 centimeters. And so, on October 12, 2008, Sissi reported: Piora Basin successfully crossed’, and its sister machine soon followed suit. [60] On the following weekend, popular festivities and special exhibitions, attended by more than 100,000 visitors, were held. Thanks to the longest rail tunnel in the world, trains now race through the Alps and scarcely have to climb - setting a milestone in transport and for the mobility of the future. Another point of note, that even in winter, the inside temperature of the tunnel can reach 38 °C (100 °F) while travelling through it.