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!