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!