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!