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!