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!