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!