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!