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