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!