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!