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!