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!