DISCUSSION. THE USE AND MAINTENANCE OF CIVIL ENGINEERING PLANT ON RAILWAY WORK. RENEWAL OF BALLAST AND TRACK BY MECHANICAL MEANS IN POLHILL TUNNEL. RAILWAY PAPERS 32 AND 33.

Keywords: RAILWAYS, PLANT, RENEWAL, BALLAST, TRACK, MECHANICAL, METHODS, TUNNELS, USE, MAINTENANCE, ORGANISATION, MACHINERY, TRACKLAYING, LAYING, MECHANISATION, MANAGEMENT, CONTROL, ADMINISTRATION, TAMPING, WAGONS, BRITISH RAILWAYS, POLHILL, KENT, UK