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!