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!