,,&&,,,&&,                                          ,&&,,,,&&&
&,&,&,,&,&                                          ,&,&,,,&,,
&&&&&&,&&&                                          &&&&&,,&&,
&,,,,,&&,,                                          &,,,,&,&,&
,&,,,,&,&,                                          &&,,,&&&&&
&&&,,,&&&&                  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!         &&,,&,&,,&
&&,&,&&,&,                                          ,,&,&&&&,&
,,&&&&,&&&                                          &,&&&,,,&&
&,&,,,&&,,                                          ,&&,,&,,&,
&&&&,,&,&,                                          &&,&,&&,&&
,,,,&,&&&&                                          ,,&&&&,&&,
,,,,&&&,,,                                          ,,&,,,&&,&