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!