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!