DISCUSSION. RAILWAY SIGNALLING AND COMMUNICATIONS. RAILWAY ENGINEERING DIVISION.

Keywords: RAILWAYS, SIGNALLING, COMMUNICATIONS, SAFETY, LIMITATION, TRACK, CIRCUITS, POWER, SUPPLY, AUTOMATIC, TRAINS, CONTROL, FINANCE, REMOTE, CODES, MAINTENANCE, APPLIANCES, EQUIPMENT, LOCKING, ELECTRIC, SIGNALS, ENGINEERS, RELIABILITY, INTERLOCKING, TRAINING, STAFF, RELAYS, DISTANCE, APPROACHES, LIGHTING, TELEPRINTERS, SWITCHING, SYSTEMS, DEVELOPMENT, RESISTANCE, BALLAST, UK, USA, THE GREAT WESTERN RAILWAY, THE METROPOLITAN RAILWAY, LONDON PASSENGER TRANSPORT BOARD