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!