The Gornergratbahn (GGB) is a 9 km long gauge mountain rack railway, with Abt rack system. It leads from Zermatt, Switzerland (1604 m), up to the Gornergrat (3089 m). The Gornergrat is a starting point for many hikes, as it lies surrounded by 29 peaks rising above 4,000 m in the Alps and several glaciers, including the Gorner Glacier (which is billed as the second longest glacier in the Alps).