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!