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!