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!