A distributed railway reservation system stores the following information
(The following description may lead to un-normalized relations,normalize them wherever required)
Train Description :-
   includes Train number,Station from which the train originate and pass,
   Time of departure and arrival at various destinations,
   Number of seats available,Number of seats reserved etc.
Passenger description :- it 
  includes Passenger code,Name,Address,ph_no,etc.
Reservation description :- 
  includes Passenger code,Train number,Seat reserved etc.
Assume that only following two application exist.
(a) A request about reservation availability :-
    All information about trains from a given source 
    to destination is to be displayed on the user terminal.
(b) A reservation request is to be fulfilled which includes:-
    1. whether the passenger's data is already available.
       If not insert passenger data
2. Checking the availability of seats
3.Inserting the reservation description.