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!