Roland Stadelman describes the construction of the Gotthard Tunnel in Switzerland. It is the deepest railway tunnel in the world, with a maximum depth of 2,450 m (8,040 ft). Roland Stadelmann, Swiss born and now a resident of Gramling South Carolina, Roland began his enthusiasm for trains at age 8 He lived in Switzerland, Germany, and Belgium, and has traveled by rail through Switzerland, Germany, Lichtenstein, Austria, Hungary, France, Italy, Belgium, and the Czech Republic. Roland models miniature trains in O, HO, and N-scale. Professionally, he is the President, CEO and owner of Foothills Financial Group, Inc. with offices in Tryon, NC, and Landrum, SC.