&&&,&,&,,,                                          &&&,&&&,&,
&,,&&&&&,,                                          ,,,&&,,&&&
,&,&,,,,&,                                          ,,,&,&,&,,
,&&&&,,,&&                                          &,,&&&&&&,
,&,,,&,,&,                                          &&,&,,,,,&
&&&,,&&,&&                  rails                   ,,&&&,,,,&
,,,&,&,&&,                                          ,,&,,&,,,&
&,,&&&&&,&                                          ,,&&,&&,,&
,&,&,,,,&& &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& &,&,&&,&,&
&&&&&,,,&,                                          &&&&&,&&&&
,,,,,&,,&& &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& ,,,,,&&,,,
,,,,,&&,&,                                          &,,,,&,&,,
,,,,,&,&&&                                          &&,,,&&&&,
,,,,,&&&,, 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. ,,&&,,&,&,
,&,,,,&,&,                                          &,&,&,&&&&
&&&,,,&&&&                 &&&&&&&&                 &&&&&&&,,,
&,,&,,&,,,                                          ,,,,,,,&,,
&&,&&,&&,, 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!        ,,,&,,,&&,
&&&,&&,&&&                                          ,,,&&,,&,&
,,,&&,&&,,                                          ,,,&,&,&&&
&,,&,&&,&,                                          &,,&&&&&,,
&&,&&&,&&&                                          ,&,&,,,,&,
&,&&,,&&,,                                          &&&&&,,,&&
,&&,&,&,&,                                          ,,,,,&,,&,