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!