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!