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!