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!