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!