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