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!