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