@,,,@,,,@@                                          ,,@,,@,@@@
,@,,@@,,@,                                          @,@@,@@@,,
,@@,@,@,@@                                          @@@,@@,,@,
,@,@@@@@@,                                          ,,,@@,@,@@
@@@@,,,,,@                                          ,,,@,@@@@,
@,,,@,,,,@                   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!         @,,,@,,,,,
,@@,@@@@,@                                          @@,,@@,,,,
,@,@@,,,@@                                          @,@,@,@,,,
,@@@,@,,@,                                          @@@@@@@@,,
,@,,@@@,@@                                          @,,,,,,,@,
,@@,@,,@@,                                          ,@,,,,,,@@
@@,@@@,@,@                                          ,@@,,,,,@,