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