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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. ,,£££,,,,,
,£,,,,,,,£ 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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