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!