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World's longest railway tunnel
The excavation work to build the world's longest railway tunnel beneath the Swiss Alps is complete.
The high-speed rail link in Switzerland, where passenger trains can travel at a maximum speed of up to 250 kilometres per hour, will be operational by 2016.
With a route length of 57 km, it surpasses the Seikan Tunnel in Japan.
A straight route with no curves or level crossings on the overground sections, the Gotthard and Ceneri Base Tunnels together make the project one of the world's most outstanding engineering marvels.
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World's longest railway tunnel
An employee of AlpTransit Gotthard and a visitor stand at the NEAT Gotthard Base tunnel near Erstfeld.
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World's longest railway tunnel
A worker uses a hammer during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld.
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World's longest railway tunnel
A worker stands beside mobile maschinery during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
Workers sitting on the special train 'Helvetia' distribute fresh concrete on the track bed of the rails in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
An Austrian and a German national flag fly on mobile machinery during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
Workers drive on a special vehicle during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
Workers use torque wrenches to fix screw nuts during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld.
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World's longest railway tunnel
An engineer sits on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker stands on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker uses a measuring gauge during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld.
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World's longest railway tunnel
Workers use finishing trowels to plane fresh concrete on the track bed of the rails in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker receives instructions from an engineer during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker stands on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker use torque wrench to fix screw nuts during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
Workers joke during a break beside the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
Workers use torque wrenches to fix screw nuts during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker adjusts a laser measuring gauge during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
An employee looks at monitors to control the mixture of concrete on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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World's longest railway tunnel
A worker prepares tools and material during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld.