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!