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!