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!