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!