DISCUSSION. THE METROPOLITAN RAILWAYS.

Keywords: METROPOLITAN RAILWAY, DISTRICT RAILWAY, CIRCLE LINE, CITY LINE, METROPOLITAN, METROPOLITAN LINE, UNDERGROUND, RAILWAYS, CITIES, TRANSPORT, UNDERPINNING, DISTRICT LINE, TIMBERING, VENTILATION, PERMANENT WAY, STATIONS, WORKS, TUNNELS, CLAYS, LONDON CLAY, TUBES, SETTLEMENT, BUILDINGS, FANS, LONDON, ENGLAND, METROPOLITAN, DISTRICT LINE, CIRCLE LINE, CITY LINE, UK