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!