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!