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£,£,£,£,£, trains  are  so  constructed  that  they ,£,£,,£,£,
£,£,£,£,£, have to follow a set path. this  path is ,£,£,££,£,
£,£,£,£,£, 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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£,£,£,£,£, trains go  by  day  and by  night. along ,£,£,££,£,
£,£,£,£,£,       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.         ,£,£,,£,£,
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£,£,£,£,£, 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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