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!