block system

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block system

[′bläk ‚sis·təm]
(civil engineering)
A railroad system for controlling train movements by using signals between block posts, that is, the structures that contain the instruments indicating the positions of trains, conditions within block sections, and control levers for signals and other functions.
(mining engineering)
A system of pillars in which a series of entries, rooms, and crosscuts are driven to divide the coal into blocks of about equal size which are then extracted on retreat.
References in periodicals archive ?
As standard, the valve bodies enable the following five functions: Use of pneumatic and/or manual operators, a sampling connection and CIP/SIP inlet, bottle filling, a CIP/SIP outlet, and a vent hole Due to the flexibility in the design of Gemu block systems, these functions can be offered with different geometries.
* Each block system will accommodate curves, steps, corners, caps and setbacks differently.
Coir block system. Combining a coir block system with suitable native woody and non-woody vegetation to construct soil lifts is an excellent way to stabilize cut and fill slopes as well as streambanks in highway construction.
Only 8 mm wide, the 1180 fits Phoenix Contact, WACO, Entrelac and other block systems without consuming valuable space.
These independent input devices do not require expensive additions such as the bus-couplers and mounting racks needed by modular or block systems.
Tenders are invited for Software maintenance, prophylaxis and updating of the block systems, monitoring systems, preparation of technical and economic indicators (TEM) and energy management (CEM) in TPP Maritsa East 2 EAD
Only 8 mm wide, the 1180 fits Phoenix Contact, Wago, Entrelec and other block systems without consuming valuable space.
Efforts have been made to reduce the headway between trains by acting on the block system; however this only has impact on a full line.