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!