@¨¨@@@¨¨@@                                          ¨¨@@@¨¨¨¨@
@¨@¨@@¨@¨@                                          ¨@¨@@¨¨¨@¨
@¨@¨¨@¨@¨@                                          ¨@¨¨@¨¨@@¨
@¨@¨@@¨@¨@                                          ¨@¨@@¨@¨@¨
@¨@¨¨@¨@¨@                                          ¨@¨¨@¨@¨@¨
@¨@¨@@¨@¨@                  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!        ¨@¨@@¨@¨@¨
@¨@¨¨@¨@¨@                                          ¨@¨¨@¨@¨@¨
@¨@¨@@¨@¨@                                          ¨@¨@@¨@¨@¨
@¨@¨¨@¨@¨@                                          ¨@¨¨@¨@¨@¨
@¨@¨@@¨@¨@                                          ¨@¨@@¨@¨@¨
@¨@¨¨@¨@¨@                                          ¨@¨¨@¨@¨@¨
@¨@¨@@¨@¨@                                          ¨@¨@@¨@¨@¨