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!