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!