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!