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!