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!