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