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Retrieved 1 July 2024. China's "Great Firewall" is one of the world's most comprehensive internet censorship regimes, preventing citizens from accessing websites like Instagram, Wikipedia and YouTube. ^ a b "China's Facebook Status: Blocked". ABC News.
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". Only one train may occupy a block at a time, [ 1] and the blocks are ...
Buffer stop. This buffer stop at Zurich HB in Switzerland is designed to move up to 7 metres (23 ft) to slow down an 850-tonne (840-long-ton; 940-short-ton) passenger train from 15 km/h (9.3 mph) without damaging the train or injuring passengers. A buffer stop, bumper, bumping post, bumper block or stopblock (US), is a device to prevent railway ...
In railway signalling, a token is a physical object which a train driver is required to have or see before entering onto a particular section of single track. The token is clearly endorsed with the names of the section to which it belongs. A token system is more commonly used for single lines because of the greater risk of collision in the ...
German practice. In Germany, block posts are known as Blockstellen (abbreviation: Bk) and are defined as railway facilities on the open line that mark the end of a block section, as part of a block system. They usually have a home signal in each direction and on each running line. They are mainly found where the distance between two railway ...
The crane, including the steam plant, could slew on a central king post bearing. This represented all the main features of the fully developed block-setting crane, although at a small scale as yet. The fixed horizontal jib extended far enough to place the hook 45 feet from the king post, and the trolley could move 20 feet in from that position.
Each passing loop is controlled by a small signal box, known as a block-post. These house the lever frames that control the points, the token equipment and telephones. The railway has few signals; instead it has stop boards at Pendre, Brynglas, Quarry Siding and Nant Gwernol, and the blockman allows trains to proceed by use of flags. [ 110 ]
Note that the radius bar is set to reverse. The Walschaerts valve gear is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgian railway engineer Egide Walschaerts in 1844. [ 1] [ 2] The gear is sometimes named without the final "s", [ a] since it was incorrectly patented under that name ...