1951 January, R. A. H. Weight, “A Railway Recorder in Essex and Hertfordshire”, inRailway Magazine, page44:
They form part of the vast electrification and reconstruction schemes which have been in hand for a number of years at Liverpool Street, and in suburban Essex, and include therearrangement of tracks, of which the Ilford flyover forms part; the modern signal boxes, now needed only at key points; the electric control or sub-stations; and a large electric car shed.
