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!