....:~/@&&                                          &&@/~:....
...:~~~^^&                                          &^^~~~:...
....~/@@&@                                          @&@@/~....
.:~/^@@@@&                                          &@@@@^/~:.
......~/@&                                          &@/~......
.:~/^@&&##                   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!        ##@/:.....
.:~/^@&###                                          ###&@^/~:.
.::~~//^&#                                          #&^//~~::.
.:~~~/^@##                                          ##@^/~~~:.
.:~/^@&@##                                          ##@&@^/~:.
.:~/^@&#@#                                          #@#&@^/~:.
.:~/^@&#@#                                          #@#&@^/~:.