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!