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  2. William Robert Sykes - Wikipedia

    en.wikipedia.org/wiki/William_Robert_Sykes

    William Robert Sykes (1840–1917) was a British engineer from London, known for his work in railway signalling and other safety devices.He is noted for the invention of the Sykes ‘Lock and block’ interlocking system of points and signals.

  3. Signalling block system - Wikipedia

    en.wikipedia.org/wiki/Signalling_block_system

    Automatic block signaling uses a series of automated signals, normally lights or flags, that change their display, or aspect, based on the movement of trains past a sensor. This is by far the most common type of block system as of 2018, used in almost every type of railway from rapid transit systems to railway mainlines. There is a wide variety ...

  4. Lot and block survey system - Wikipedia

    en.wikipedia.org/wiki/Lot_and_block_survey_system

    A contemporary plat map used in the lot and block system. The lot and block survey system is a method used in the United States and Canada to locate and identify land, particularly for lots in densely populated metropolitan areas, suburban areas and exurbs. It is sometimes referred to as the recorded plat survey system or the recorded map ...

  5. Token (railway signalling) - Wikipedia

    en.wikipedia.org/wiki/Token_(railway_signalling)

    On the New Zealand Railways, where most lines are single track, multiple systems were used like the Winter’s block system and Sykes’ lock and block working. On the North Island Main Trunk [ 9 ] and on other lines like the Wairarapa Line , the Tyer’s Electric Train Tablet with the No. 7 instrument was used.

  6. 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.

  7. Railway signalling - Wikipedia

    en.wikipedia.org/wiki/Railway_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 may also be controlled by a signalman, so that they only provide a proceed indication if the signalman sets the signal accordingly and the block is clear.

  8. Settings A-Z - AOL Help

    help.aol.com/settings

    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  9. Absolute block signalling - Wikipedia

    en.wikipedia.org/wiki/Absolute_block_signalling

    Absolute block signalling is a British signalling block system designed to ensure the safe operation of a railway by allowing only one train to occupy a defined section of track (block) at a time. [1] Each block section is manually controlled by a signalman, who communicates with the other block sections via telegraph.