Definition of permissive blocking. Meaning of permissive blocking. Synonyms of permissive blocking

Here you will find one or more explanations in English for the word permissive blocking. Also in the bottom left of the page several parts of wikipedia pages related to the word permissive blocking and, of course, permissive blocking synonyms and on the right images related to the word permissive blocking.

Definition of permissive blocking

permissive blocking
Block system Block system (Railroads) A system by which the track is divided into short sections, as of three or four miles, and trains are so run by the guidance of electric, or combined electric and pneumatic, signals that no train enters a section or block until the preceding train has left it, as in absolute blocking, or that a train may be allowed to follow another into a block as long as it proceeds with excessive caution, as in permissive blocking.

Meaning of permissive blocking from wikipedia

- broken up into a series of sections or "blocks". Only one train may occupy a block at a time, and the blocks are sized to allow a train to stop within...
- Permissive Working on a railway in the United Kingdom allows more than one train at a time to be on the same line in a block section, a signal section...
- on a few suburban sections from 1900. Tyer's Three-Wire Block was used for permissive block working on the Up Relief line from Concord West to North...
- A permissive action link (PAL) is an access control security device for nuclear weapons. Its purpose is to prevent unauthorized arming or detonation of...
- block before the signalman sees that the disc or lamp is missing, they ask the next signal box to stop the train and investigate. Under a permissive block...
- Negative Sequence Directional Overcurrent 68 - Blocking Relay / Power Swing Blocking 69 - Permissive Control Device 70 - Rheostat 71 - Liquid Switch...
- of the platform. In automatic block signalling, the signalling device is generally one of three categories: Non-permissive signals are absolute signals;...
- introduction of the absolute block principle; all systems of working other than this (including time-interval and permissive block) were outlawed on p****enger...
- tracks. Many western railroads used an automatic system called absolute permissive block (APB), where trains entering a stretch of single track would cause...
- additional numbering plan area, ****igned the area code 909. After an initial permissive dialing period, dialing of the area code became mandatory in August 1993...