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!