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!