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