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!