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!