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!