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!