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!