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££,,£££,,,                                          ££££,,,,,,
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,,££,,££££ because  the  low friction  between  the ££,,££,,,,
£,,,,,,£££ wheels  of the train and the rail metal, ,,,,,,,£££
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,,,££,,,,£ can  be, and even  more so for  how much ,££££,,,,,
££,,,,££,, 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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,,,,,,,,,,                                          ,££££,,££,
££££££££££ there  will be trees  on the side of the ,,££,,,,,,
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£,,£££££££ there  will  be  plains, and  bodies  of ,££,,,,,,£
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££,,,,,,££ scattered,  often put  on top  of poles, ££,,££££,,
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£,,,,,,£££         different speed limits.          £££,,££,,£
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£,,££,,,,, sometimes, trains have  to stop and wait £,,£££££££
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