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!