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!