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!