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!