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