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!