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!