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!