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!