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!