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!