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!