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Block slippage was common enough that it is an allowable loophole in the rules to recall the start of a race without calling a false start against an athlete whose blocks slip. In some amateur settings, such as high school track, since block slippage is much more common due to lower quality track surface material and/or starting blocks' spike ...
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".
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.
Although most use occurs in regional areas, some use appears in the capital city, Bangkok, such as the Makkasan to Khlong Tan section etc. [16] Sri Lanka Railways uses a tablet exchanging system on the up-country railway line. Russian Railways uses Electric Token Block on some lines, most notably the Yanisyarvi – Lodeynoe Pole railway.
Direct traffic control (DTC) is a system for authorizing track occupancy used on some railroads instead of or in addition to signals.It is known as "direct" traffic control because the train dispatcher gives track authority directly to the train crew via radio, as opposed to through wayside personnel via telephone or telegraph, as in train orders.
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Not all blocks are controlled using fixed signals. On some single track railways in the UK, particularly those with low usage, it is common to use token systems that rely on the train driver's physical possession of a unique token as authority to occupy the line, normally in addition to fixed signals.
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