Stock Photo - 12 May 2021, Switzerland, Goldau: The rack invented by Niklaus Riggenbach looks like a ladder. It lies between the rails for the wheels of steam locomotive 7. A large cogwheel is mounted under the locomotive and carriages, which engages the teeth. On 21 May 1871, exactly 150 years ago, the Rigi Railway became Europe's first mountain railway. Photo: Christiane Oelrich/dpa. - Goldau/Switzerland

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