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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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