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!