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!