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!