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During the Second World War (1939–1941 and 1943–1946) Gruner was in charge of several military construction works in his homeland. Between 1941 and 1943 he was in charge of railways and power plants construction in Norway.[1] From 1946 he was mainly involved in projects outside Europe. In 1947 he experienced the death of his father, Heinrich Gruner, who had established an engineering company of his own in 1862.[2] In 1948, Gruner became partner in his late father's company. As the responsible for the Public Works Department, Gruner directed the construction of power plants, railways and irrigation systems in India, Pakistan, Syria, Sudan and Uruguay.
In 1976 he was asked by a subcommittee of the United Nations General Assembly..
SEDRUN, Switzerland -- Swiss engineers have smashed through the last stretch of rock to create the longest tunnel in the world. A gigantic drilling machine broke the remaining wall 8,200 feet (2,500 meters) below the imposing Piz Vatgira peak in the Gotthard massif several minutes ahead of schedule Friday afternoon. Miners, VIPs and journalists inside the tunnel cheered as Switzerland reclaimed the tunnel record from Japan's Seikan Tunnel.
The 35.4-mile (57-kilometer) Gotthard Base Tunnel is an important milestone in the creation of a high-speed rail network connecting all corners of Europe. It will allow millions of tons of goods currently transported through the Alps on heavy trucks to be shifted onto the rails.
...european road traffic on this major route through the Alps, while simultaneously developing Europe’s high-speed rail network. The existing tunnel, much higher up, can only handle three-truck freight trains of up to 2,000 tons. The new tunnel will take 4,000 ton heavy freight trains – carrying entire trucks on board - effortlessly through the heart of the mountains. Passenger trains will be able to travel at speeds of up to 250kmph, resulting in a train journey time between Zurich and Milan of just two hours and 40 minutes – a third less than at present.