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!