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!