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!