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!