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!