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!