Tourists walk past trains of the Jungfraubahn railways at the Kleine Scheidegg station (altitude 2061 metres/6762 feet) near the Swiss mountain resort of Grindelwald July 25, 2012. The Jungfraubahn cog railway line, considered pioneering for the steep incline of its 7 km tunnel dug behind the Eiger mountain's North Face, is celebrating its hundredth anniversary on August 1. In the background is seen the North Face of Eiger mountain (left, altitude 3970 metres/ 13025 feet). Picture taken July 25, 2012. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: TRANSPORT TRAVEL)