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!