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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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An employee of AlpTransit Gotthard and a visitor stand at the NEAT Gotthard Base tunnel near Erstfeld.
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A worker uses a hammer during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld.
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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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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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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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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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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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An engineer sits on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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A worker stands on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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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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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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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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A worker stands on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012.
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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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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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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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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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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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A worker prepares tools and material during the installation of the railway tracks in the NEAT Gotthard Base tunnel near Erstfeld.