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No title. Trunk telephone exchange under city, Holborn, London. Travelling shot through trunk testing bay at the underground exchange, row of men are operating switchboard. C/U engineer working in trunk testing bay. Tracking shot through trunk testing bay. M/S illuminated sign hanging on wall which gives directions to various tunnels. C/U sign: “Tea Bar Alley“, pan to show section of tunnel with tables in it. M/S of a small mechanical train being driven through tunnel. C/U sign: “Goods Alley“. Camera pans round to show another long tunnel. Tracking shot of automatic switch gear. M/S looking down tunnel full of cables. C/U of cables. M/S of engineer in front of control panel. C/U engineer speaking into telephone. M/S tunnel where power is generated: there are large panels with switch gear and electrical dials. C/U of a large dial. M/S of engineer looking at dials. M/S of engineer throwing in a large electrical switch. M/S of man working at Telex machine, pan to show the Telex Room (the
