With the opening of the Jubilee Line Extension , the opportunity was taken to introduce new trains , and today the line is worked by 1996 trains . With the construction of the Jubilee line Extension , the opportunity was taken to introduce new trains , and today the line is worked by 1996 stock , which has an exterior similar to the 1995 stock in use on the Northern line but ( in spite of the confusing naming ) is technically less advanced .