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!