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!