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!