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!