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!