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  2. Absolute block signalling - Wikipedia

    en.wikipedia.org/wiki/Absolute_block_signalling

    In absolute block working, a block section (or simply section) is a section of railway line between one signal box and another – in the typical absolute block, lines are paired, with an up – towards London (or in Scotland, Edinburgh) – and a down line in the opposite direction.

  3. Signalling block system - Wikipedia

    en.wikipedia.org/wiki/Signalling_block_system

    A block instrument on the Midland Railway. Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks".

  4. Railway signalling - Wikipedia

    en.wikipedia.org/wiki/Railway_signalling

    The invention of train detection systems such as track circuits allowed the replacement of manual block systems such as absolute block with automatic block signalling. Under automatic block signalling, signals indicate whether or not a train may enter a block based on automatic train detection indicating whether a block is clear. The signals ...

  5. Automatic block signaling - Wikipedia

    en.wikipedia.org/wiki/Automatic_block_signaling

    Automatic block signaling (ABS), spelled automatic block signalling or called track circuit block (TCB [1]) in the UK, is a railroad communications system that consists of a series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using automatic signals.

  6. Quorum sensing - Wikipedia

    en.wikipedia.org/wiki/Quorum_sensing

    In biology, quorum sensing or quorum signaling (QS) [1] is the process of cell-to-cell communication [2] that allows bacteria to detect and respond to cell population density by gene regulation, typically as a means of acclimating to environmental disadvantages.

  7. Lever frame - Wikipedia

    en.wikipedia.org/wiki/Lever_frame

    A mechanical lever frame inside the signal box at Knockcroghery in Ireland Waterloo station A signalbox, LSWR (Howden, Boys' Book of Locomotives, 1907). Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks [1] and points to allow the safe operation of trains in the area the signals control.

  8. Swiss railway signalling - Wikipedia

    en.wikipedia.org/wiki/Swiss_railway_signalling

    Signalling is governed by strict rules, released by the Federal Office of Transport. The rules for railway operation are laid out in the Swiss Rail Service Regulations (Fahrdienstvorschriften (in German), Prescriptions de circulation des trains (PCT) (in French), Prescrizioni sulla circolazione dei treni (PCT) (in Italian)), of which the latest version was issued in 2012, valid since 1 July ...

  9. Biological network - Wikipedia

    en.wikipedia.org/wiki/Biological_network

    A biological network is a method of representing systems as complex sets of binary interactions or relations between various biological entities. [1] In general, networks or graphs are used to capture relationships between entities or objects. [1]