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!