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£,££,£,£,£                                          ,£,££,,£,£
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£,££,£,£,£ called a "railway",  which  is comprised ,£,££,,£,£
£,,£,£,£,£ of two metal  rails, hence its nickname. ,£,,£,££,,
£,££,£,£,£                                          ,£,££,,£,£
£,,£,£,£,£ because  the  low  friction  between the ,£,,£,££,,
£,££,£,£,£ wheels of the train and  the rail metal, ,£,££,,£,£
£,,£,£,£,£ there  are limits for  how acute a curve ,£,,£,££,,
£,££,£,£,£ 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 ,£,,£,££,,
£,££,£,£,£ tunnels  (if   they   are   large),   or ,£,££,,£,£
£,,£,£,£,£            artificial chasms.            ,£,,£,££,,
£,££,£,£,£                                          ,£,££,,£,£
£,,£,£,£,£ there will be trees  on the  side of the ,£,,£,££,,
£,££,£,£,£ rails, but not  too close, or  they will ,£,££,,£,£
£,,£,£,£,£ be cut  down by  the  railway  janitors. ,£,,£,££,,
£,££,£,£,£ there  will be  plains,  and  bodies  of ,£,££,,£,£
£,,£,£,£,£                  water.                  ,£,,£,££,,
£,££,£,£,£                                          ,£,££,,£,£
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£,££,£,£,£       the way, there is information      ,£,££,,£,£
£,,£,£,£,£ scattered, often  put  on  top of poles, ,£,,£,££,,
£,££,£,£,£ to be  interpreted by the train drivers. ,£,££,,£,£
£,,£,£,£,£ different  parts  of  the  railway  have ,£,,£,££,,
£,££,£,£,£          different speed limits.         ,£,££,,£,£
£,,£,£,£,£                                          ,£,,£,££,,
£,££,£,£,£ sometimes, trains have to  stop and wait ,£,££,,£,£
£,,£,£,£,£ for  something to happen, far away. this ,£,,£,££,,
£,££,£,£,£ is  signaled  by  red  or  green lights. ,£,££,,£,£
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£,££,£,£,£ many people follow  the  rails  by foot. ,£,££,,£,£
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£,££,£,£,£ path between  two  points. however  this ,£,££,,£,£
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