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!