closed-circuit signalling
1Token (railway signalling) — A token being offered by a signalman on the Keighley and Worth Valley Railway …
2Track circuit — A track circuit is a simple electrical device used to detect the presence or absence of a train on rail tracks, used to inform signallers and control relevant signals. Principles and operation The basic principle behind the track circuit lies in… …
3Norwegian railway signalling — The signalling system used on the rail transport in Norway is regulated by the Regulations of December 4, 2001 no. 1336 about signals and signs on the state s railway network and connected private tracks. The first signalling system on the… …
4Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
5Railways in Melbourne — Melbourne rail network  City Loop  Caulfield group  Frankston line  Pakenham line  Sandringham line  Cranbourne line …
6Doncaster PSB — (Power Signal Box) is a signalling centre on the East Coast Main Line railway in the United Kingdom, principally covering the line from London to Edinburgh but also encompassing other lines diverging and converging to the ECML. The signal box… …
7Delhi Metro — दिल्ली मेट्रो Info Locale NCR, India (Delhi, Gurgaon, Noida) …
8Midland Metro — Overview Type Tram/light rail[1] Status active …
9Broadcast television systems — There are several broadcast television systems in use in the world today. An analogue television system includes several components: a set of technical parameters for the broadcast signal, a system for encoding color, and possibly a system for… …
10Oxygen toxicity — Classification and external resources In 1942–43 the UK Government carried out extensive testing for oxygen toxicity in divers. The chamber is pressurised with air to 3.7  …
