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!