Extract the answer to the question from the following context. Question: What structural elements allow a climbing elevator to move? Context: A climbing elevator is a self-ascending elevator with its own propulsion. The propulsion can be done by an electric or a combustion engine. Climbing elevators are used in guyed masts or towers, in order to make easy access to parts of these constructions, such as flight safety lamps for maintenance. An example would be the Moonlight towers in Austin, Texas, where the elevator holds only one person and equipment for maintenance. The Glasgow Tower an observation tower in Glasgow, Scotland also makes use of two climbing elevators.
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Answer: an electric or a combustion engine

Extract the answer to the question from the following context. Question: What determines the closure of the railway? Context: The Exeter to Plymouth railway of the LSWR needs to be reopened to connect Cornwall and Plymouth to the rest of the UK railway system on an all weather basis. There are proposals to reopen the line from Tavistock to Bere Alston for a through service to Plymouth. On the night of 4 February 2014, amid high winds and extremely rough seas, part of the sea wall at Dawlish was breached washing away around 40 metres (130 ft) of the wall and the ballast under the railway immediately behind. The line was closed. Network Rail began repair work and the line reopened on 4 April 2014. In the wake of widespread disruption caused by damage to the mainline track at Dawlish by coastal storms in February 2014, Network Rail are considering reopening the Tavistock to Okehampton and Exeter section of the line as an alternative to the coastal route.
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Answer: weather

Extract the answer to the question from the following context. Question: What is an interesting fact that you would not expect to see? Context: Civil strife in the early 1990s greatly increased the size of the Somali diaspora, as many of the best educated Somalis left for the Middle East, Europe and North America. In Canada, the cities of Toronto, Ottawa, Calgary, Edmonton, Montreal, Vancouver, Winnipeg and Hamilton all harbor Somali populations. Statistics Canada's 2006 census ranks people of Somali descent as the 69th largest ethnic group in Canada.
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Answer:
Statistics Canada's 2006 census ranks people of Somali descent as the 69th largest ethnic group in Canada