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!