Collision Avoidance System (CAS)

The Collision Avoidance System (CAS) is an advanced technology designed to enhance safety in transportation, particularly in rail systems. In India, the implementation of Kavach, a homegrown CAS, has gained attention due to recent train accidents highlighting the need for better safety measures.

Key Features of CAS

• Real-Time Data: CAS systems rely on real-time information regarding the positions of vehicles, ensuring that trains can detect potential collisions with other trains or obstacles.
• Two Main Data Inputs:
• Location of Other Vehicles: Information about the locations of all nearby trains and obstacles.
• Vehicle's Own Location: The system determines its own position relative to these other vehicles.

Functionality

• Assisting Drivers: In scenarios where a train is operated by a human, CAS acts as an assistive technology, providing alerts and warnings to the driver to prevent accidents.
• Autonomous Operation: In fully automated trains, CAS can take control and maneuver the vehicle to avoid collisions, enhancing safety without human intervention.

Importance

• Enhancing Safety: The primary goal of CAS is to minimize the risk of collisions, thus protecting passengers, cargo, and railway infrastructure.
• Addressing Delays in Implementation: The recent focus on the slow rollout of Kavach emphasizes the need for timely implementation of safety technologies in the Indian Railways to prevent accidents.

Reasons Behind Railway Accidents

• Derailments:
• Responsible for approximately 70% of train crashes in India, according to a 2020 safety report. A Comptroller and Auditor General report noted that from 2018 to 2021, 7 in 10 railway accidents were due to derailments.
• Human Errors:
• Errors by railway staff due to fatigue, negligence, corruption, or disregard for safety procedures can lead to accidents. These errors often arise from inadequate training or stressful working conditions.
• Signalling Failures:
• Failures in the signalling system, caused by technical glitches, power outages, or human mistakes, can lead to dangerous situations where trains may collide or misroute.
• Unmanned Level Crossings (UMLCs):
• While many UMLCs have been removed, risks remain at manned level crossings (MLCs). Accidents can occur due to inadequate barriers or signals.
• Infrastructure Defects:
• Poorly maintained railway infrastructure, including tracks and bridges, contributes to accidents. Ageing assets, vandalism, sabotage, and natural disasters can exacerbate this issue. Overcapacity on certain routes increases congestion and risk.
• Safety and Information Flow Challenges:
• The "top-down" approach in safety management can create distrust between authorities and frontline staff, resulting in superficial compliance. This culture may obscure underlying safety issues, leading to accidents stemming from ignored warnings or unsafe practices.

Steps Taken by Railways to Reduce Accidents

• Sufficient Funding:
• Establishment of the Rashtriya Rail Sanraksha Kosh (RRSK), a safety fund with a corpus of Rs 1 lakh crore over five years for critical safety works, including track renewals and signalling projects. The capital expenditure allocation has increased significantly, with over Rs 2.5 lakh crore allocated for 2023-24 and again for 2024-25.
• Expansion of Railway Network:
• Efforts to extend the rail network and augment capacity on congested routes. The National Rail Plan 2030 aims to identify new freight and high-speed rail corridors and improve the average speed of trains.
• LHB Design Coaches:
• Introduction of lighter and safer coaches based on German technology, featuring anti-climbing designs, fire-retardant materials, and improved durability.
• Modern Track Structure:
• Implementation of stronger, more durable track systems, including prestressed concrete sleepers and higher tensile strength rails.
• Technological Upgradation:
• Adoption of modern technologies in coach and wagon design, including Modified Centre Buffer Couplers and Bogie Mounted Air Brake Systems. The installation of KAVACH, an Automatic Train Protection system, enhances safety by preventing collisions.
• Block Proving Axle Counter (BPAC):
• A train detection system that ensures safe railway traffic control by preventing two trains from being in the same block section simultaneously.

Electronic Interlocking (EI)

• Definition: EI employs computer-based systems and electronic equipment to control signals, points, and level-crossing gates.
• Advantage: Unlike traditional relay interlocking systems, EI uses software and electronic components, ensuring efficient management of interlocking logic.
• Functionality: EI synchronizes all components, facilitating smooth and uninterrupted train movements.
• Current Status: As of 2022, 2,888 stations in India were equipped with electronic interlocking, covering 45.5% of the Indian Railways network.

Kavach System

About:

• Launch: Introduced in 2020, Kavach is a cab signaling train control system designed with anti-collision features.
• Development: Created by the Research Design and Standards Organisation (RDSO) in collaboration with three Indian vendors.
• Standards: It is recognized as the National Automatic Train Protection (ATP) System and adheres to Safety Integrity Level-4 (SIL-4) standards.
• Function: Acts as a vigilant system that alerts the loco pilot of approaching 'red signals' and can apply automatic brakes to prevent overshooting.

Components:

• RFID Technology: Integrated into the tracks to facilitate automatic identification and information reading without physical contact.
• Driver’s Cabin Equipment: Includes RFID readers, a computer, and brake interface equipment to ensure proper communication and safety measures.
• Radio Infrastructure: Involves towers and modems installed at railway stations for centralized monitoring.

Current Status:

• Network Coverage: Kavach aims to secure India's railway network of over 68,000 km, but only 1,500 km are currently equipped with the system.
• Cost: Installation costs are ₹50 lakh per km for trackside components and ₹70 lakh per train.
• Future Goals: Plans to cover 6,000 km by 2025, including crucial routes like Delhi-Mumbai and Delhi-Howrah. Expected to increase installation capacity from 1,500 km to 5,000 km annually by 2026.
• Upgrades: Future enhancements include making the system compatible with 4G/5G technology.

Committees' Recommendations

• Kakodkar Committee (2012):
• Emphasis on adopting advanced technologies for track maintenance and inspection.
• Recommendations for enhancing human resource development and management.
• Bibek Debroy Committee (2014):
• Suggested separating the railway budget from the general budget.
• Advocated for outsourcing non-core activities.
• Recommended the creation of a Railway Infrastructure Authority of India.
• Vinod Rai Committee (2015):
• Proposed the establishment of an independent Railway Safety Authority with statutory powers.
• Recommended forming a Railway Accident Investigation Board for impartial inquiries.
• Suggested creating a separate Railway Infrastructure Company to manage railway assets.

Steps Needed to Enhance Safety in Indian Railways

• Creating a Statutory Railway Safety Authority:
• Establish a dedicated authority with the power to set safety standards, conduct audits, enforce accountability, and investigate accidents.
• Confidential Incident Reporting and Analysis System (CIRAS):
• Implement a system similar to the UK's CIRAS to promote a culture of safety, focusing on correction rather than punishment.
• Enhance Coordination and Communication:
• Improve communication among various railway entities, including the railway board, zonal railways, divisions, and research organizations.
• Invest More in Safety-Related Works:
• Increase funding for critical safety infrastructure such as track renewals, bridge repairs, and signaling upgrades.
• Train Employees to Minimize Human Errors:
• Provide ongoing training for railway staff on new technologies, safety protocols, and operational procedures.
• Improve Infrastructure:
• Conduct regular checks on railway tracks, especially for seasonal expansions and contractions, requiring structural evaluations every three months.
• Adopt Advanced Technologies:
• Install anti-collision devices like Kavach, Train Collision Avoidance System (TCAS), Train Protection Warning System (TPWS), and Automatic Train Control (ATC) across the network.
• Emulate Successful Automatic Train Protection Systems:
• Learn from successful systems in other regions, such as the robust protections in Mumbai's suburban rail system.
• Introduce Performance-Linked Incentives:
• Reward railway staff based on performance and adherence to safety rules to foster a culture of accountability.
• Ensure Accountability:
• Present an annual performance report of the Railways to Parliament, similar to the Economic Survey, focusing on internal audits and safety performance.
• Evaluate Indian Railways Management Service (IRMS):
• Assess the impact of the IRMS scheme on safety and consider revisions to enhance specialization and commitment.

Learning From Global Best Practices

• United Kingdom:
• The Train Protection and Warning System (TPWS) automatically stops trains that pass danger signals or exceed speed limits, contributing to low accident rates.
• Japan:
• Japan's Shinkansen trains have maintained a perfect safety record due to advanced systems like Automatic Train Control (ATC) and earthquake warning systems.

By implementing these measures and learning from international practices, Indian Railways can significantly enhance safety and reliability across its network.