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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.          £,,,£,,,,,
,,,,,,,£££                                          ,£,,,£,,,,
,,,,,,,£,£ 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. £,,£,,,,£,
,,,£,,,,,, often  this proves  to  be  the  shorter ,£,,£,,,,£
£,,,£,,,,, path  between two  points. however  this ,,£,,£,,,,
,£,,,£,,,, is   frowned  upon,  and  very  impolite £,,£,,£,,,
,,£,,,£,,,         toward the train drivers!        ££,,£,,£,,
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