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!