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!