sentences:  Both Billinton and A. H. Panter, head of the Lancing carriage department, were now required to submit all their proposals for new construction to the LBSCR Locomotive Committee, and proposals for alterations of existing stock to the Superintendent of the Line and the general manager.Under construction at the time of Billinton's promotion were Marsh-designed locomotives of the H2, J and I3 classes.The six members of the H2 class were a superheated development of the H1 Marsh Atlantics, authorised in April 1911 and entering traffic between June 1911 and January 1912, with minor alterations to Marsh's original design by Billinton.