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!