What is Permissive Block (or Absolute Permissive Block) Signalling?

Latest News

RailOne App का Digital Ticketing Adoption बढ़ा; Jammu Division में छोटे Stations पर 28% Unreserved Tickets Mobile से

View All >>

1 Rail News

RailOne App का Digital Ticketing Adoption बढ़ा; Jammu Division में छोटे Stations पर 28% Unreserved Tickets Mobile से

East Central Railway GDCE 2026: कर्मचारियों के लिए 1,465 पदों पर Departmental Career Opportunity
Southern Railway Apprentice Recruitment 2026: 4,471 Training Slots; आवेदन 27 सितंबर तक
8th CPC ने Cadre Data Collection में 32-Point Information Framework मांगा
Indian Railway Health Service Rules, 2026 लागू: Railway Medical Service Recruitment Rules, 1999 का स्थान लिया
RRB JE CEN 04/2026: CBT-I की तारीख घोषित — परीक्षा 27, 28 और 30 अक्टूबर को
Raipid Rail क्या है? कैसे बदलेगा शहरों का भविष्य | Delhi-Meerut RRTS पूरी जानकारी
SHINE Module Indian Railways: महिला रेलकर्मी अब ऑनलाइन दर्ज कर सकेंगी यौन उत्पीड़न की शिकायत

view all>>

2 Railway Employee

East Central Railway GDCE 2026: कर्मचारियों के लिए 1,465 पदों पर Departmental Career Opportunity

view all>>

3 Always Important

All India TLC (Indian Railway) Phone Numbers

view all>>

What is Permissive Block (or Absolute Permissive Block) Signalling?

July 16, 2019, 1:05 PM

Normally, in Absolute Block Signalling, the single-line section between points where sidings or loops are provided must be treated as a single block in order to prevent two trains from entering it at the same time. However, this also reduces track utilization in the case of trains following one another in the same direction.

In these cases, a variant of absolute block signalling is used, called Absolute Permissive Block, where for opposing movements (trains in opposite directions), the single-line section is treated as a single block, whereas for following movements (same direction), the single-line section is treated as a sequence of smaller blocks, allowing many trains to be on the single line at the same time.

This is done by having lineside signals at several points along the single-line, which function as normal block signals for following movements; but for opposing movements, all signals for an opposing train turn ‘on’ (‘stop’) for the section of track in front of a train that is already in the single-line section. Permissive block signalling is more often used for freight movements than for passenger trains. Sections with absolute permissive block include Gorakhpur-Chupra (NER) and Bongaigaon-Changsari (NFR).

Source – IFRCA.org

Admin Title

Rail News Center रेलवे कर्मचारियों, परीक्षार्थियों एवं पाठकों के लिए रेलवे से जुड़ी नवीनतम खबरें, नियम, सर्कुलर एवं उपयोगी जानकारी सरल भाषा में प्रस्तुत करने वाला एक जानकारी आधारित पोर्टल है। Also See – www.informationcenter.co.in/index1.php?page_id=2

Disclaimer: Disclaimer: The Information, News, Videos, Articles, and other content provided on this platform have been collected, compiled, or referenced from various sources available in the public domain. We believe that “Knowledge Is Power” and our aim is to create general awareness among people and make useful information easily accessible to everyone. While we make reasonable efforts to present information accurately and responsibly, we do not guarantee that all information, news, videos, or other content published on this platform is complete, current, or free from errors. Users are advised to independently verify important information from official or authoritative sources before relying upon it or taking any action based on it. NOTE: The content on this platform is intended for general information and awareness purposes only and should not be considered as professional, legal, financial, medical, or official advice. Knowledge Hub Information Center does not assume responsibility for any loss, damage, or consequence arising from reliance on information published on this platform.

This entry was posted in 2 Railway Employee, STUDY NEW, Railway Employee