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!