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£,£,,£££,,                                          £,££,,£,,,
£££,£,,£,£ because  the  low friction  between  the ££,£,££,,£
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££,£,£,£££ can  be, and even more so  for how  much £,,£,,,,£,
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£,,,,,£,,£ sloped. thus a railway is often not  led ££,£,,£,,£
£,,,,££,£, on top of hills, rather through  them in ,£££,££,£,
£,,,£,£££, tunnels   (if  they   are   large),   or £,,££,££££
£,,£££,,££            artificial chasms.            £,£,££,,,,
£,£,,£,£,,                                          ££££,£,,,£
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££££,£££££ there  will  be  plains, and  bodies  of £,££,,£,££
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£,,,£,,,,£       the way, there is information      £,,£££,£,,
£,,££,,,£, scattered, often  put  on top of  poles, £,£,,£££,£
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££££,,,,£, is signaled  by  red  or  green  lights. £,££££££,,
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