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!