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!