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!