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£,££,,,,££ wheels of the train and the  rail metal, £,£,££££,,
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£,,£,£,£££ the  ground   under  the  rails  can  be ,,££,£,,£,
£,£££££,,£ sloped. thus a railway is  often not led ,£,£££,£££
££,,,,£,££ on top  of hills, rather through them in £££,,££,,,
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££,£,£££££ is  signaled  by  red  or  green lights. ,,£,,,,£,£
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