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!