How do Tube Train Signals Work? Sub Surface Explained | 4. Signalling

Signals essentially prevent trains from crashing into each other, but with a network the size of London’s Underground network, complex and intuitive signalling systems are needed to keep trains running safely and punctually. Traditional signals are often used on the network, as well as more recent digital systems such as CBTC - a type of moving block system. Underground: https://en.wikipedia.org/wiki/London_Underground Crash: https://stock.adobe.com/uk/search?k=train+wreck Automatic train: https://www.railwaygazette.com/modes/paris-driverless-metro-train-contract-awarded/48291.article Semaphore: https://en.wikipedia.org/wiki/Railway_semaphore_signal Double yellow signal: https://www.dreamstime.com/double-yellow-railway-signal-train-track-uk-hampshire-february-two-lights-showing-preliminary-caution-to-driver-image186938993 Squid Game: https://www.gamesradar.com/squid-games-red-light-green-light-gets-an-unreal-engine-version/ Victoria Line: https://tfl.gov.uk/corporate/about-tfl/culture-and-heritage/corporate-archives/20-highlights-of-our-collections Thales: https://clico.ee/vendors/thales CBTC map: https://content.tfl.gov.uk/pic-20171013-agenda-item07.pdf Background Music: Ciaconas - Ciacona in D major, T.202 https://musopen.org/music/43606-ciaconas/#google_vignette