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!