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!