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!