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!