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!