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