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!