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!