Overview
EN 13848-6:2026 is a European standard developed by CEN, focusing on the characterization and classification of railway track geometry quality. As part of the broader EN 13848 series, this standard establishes methods for assessing and categorizing the quality of track geometry based on parameters specified in EN 13848-1. It introduces criteria for dividing railway track sections into various track geometry classes, supporting effective maintenance, operational safety, and network management.
EN 13848-6:2026 applies to mainline railway tracks with a nominal gauge of 1,435 mm or greater. It is not intended for urban rail systems or lines with a narrower gauge.
Key Topics
- Track Quality Index (TQI): A numerical value derived from geometric measurements that quantifies track geometry quality.
- Track Quality Class (TQC): Standardized categories (A to E) that classify track sections according to speed and TQI values, ranging from best (A) to worst (E).
- Parameters for Assessment: Focused primarily on longitudinal level and alignment, as per EN 13848-1, but may include additional geometric characteristics such as twist, cross-level, and track gauge.
- Assessment Methods:
- Standard Deviation (SD): Primary reference method for calculating TQI, representing the dispersion of geometric measurements over a section.
- Counting Isolated Defects: Monitoring singular geometric defects that exceed relevant thresholds.
- Combined Standard Deviation (CoSD): Aggregates deviations across multiple track geometry parameters.
- Alternative Methods: Point Mass Acceleration (PMA), Vehicle Response Analysis (VRA), and Power Spectral Density (PSD).
- Aggregation Levels: Analysis approaches tailored for detailed interventions, maintenance planning, and strategic overview.
- Speed Ranges: TQI and TQC classifications are contextually tied to maximum line speeds, with specific threshold values designated for ranges up to 300 km/h.
Applications
EN 13848-6:2026 enables railway stakeholders to:
- Benchmark Track Quality: Use TQI and TQC classifications to compare the condition of different network sections objectively.
- Plan and Prioritize Maintenance: Infrastructure managers can identify track sections needing intervention or renewal based on predefined quality thresholds.
- Track Acceptance and Quality Monitoring: Supports the acceptance of new or renewed track as well as ongoing monitoring for contractual compliance.
- Network Management: Facilitates strategic planning by summarizing large datasets into actionable insights for network-wide or corridor-level decision making.
- Vehicle Compatibility: Serves as a reference for vehicle designers to match rolling stock to track quality, ensuring optimal ride quality and safety.
- Performance Indicators: TQCs can act as key performance indicators (KPIs) within maintenance strategies or contractual agreements between stakeholders.
Related Standards
To ensure comprehensive track geometry quality assessment and compatibility, the following standards within the EN 13848 series and related documents should be considered:
- EN 13848-1: Characterization of track geometry parameters (base document for measurable parameters).
- EN 13848-2: Measurement tools - Track recording vehicles.
- EN 13848-3: Measurement tools - Track construction and maintenance machines.
- EN 13848-4: Manual and lightweight measuring devices.
- EN 13848-5: Requirements for geometric quality levels, including intervention values.
- EN 17343: General terms and definitions for railway applications.
- EN 14363: Testing for wheel-rail interaction and vehicle response.
EN 13848-6:2026 lays the foundation for unified, transparent, and reproducible track geometry quality evaluation across European mainline railways, enabling improved safety, efficiency, and asset management across the network.