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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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