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!