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!