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!