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!