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!