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!