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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.                  £,£,,£,,£,
£,£,£,£,£,                                          £,£,££,££,
£,£,£,£,£, 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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