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!