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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.
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.
The modern-day system mostly uses two, three, and four aspect colour-light signals using track circuit – or axle counter – block signalling. [1] [2] It is a development of the original absolute block signalling that is still being used on many secondary lines. The use of lineside signals in Britain is restricted to railways with a maximum ...
Most blocks are "fixed", i.e. they include the section of track between two fixed points. On timetable, train order, and token-based systems, blocks usually start and end at selected stations. On signalling-based systems, blocks start and end at signals. The lengths of blocks are designed to allow trains to operate as frequently as necessary.
The block comes after public outrage in Turkey caused by the murder of two women by a 19-year-old man in Istanbul this month. Content on social media showed Discord users subsequently praising the ...
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Neither this article nor Signalling block system makes clear what it is that is absolute in this form of block signalling. If there is to be a sensible dividing line and minimal overlap between the two articles, it would be helpful to make this clear. --TedColes 08:50, 24 August 2021 (UTC)