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!