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!