Rail Size Chart In mm

Understanding the specific dimensions of railway components is crucial for ensuring safety, compatibility, and longevity in track construction and maintenance. A detailed rail size chart in mm provides engineers, technicians, and project managers with the essential data needed to select the correct rail profiles for various applications, from mainline tracks to industrial crane ways. This guide offers an in-depth look at the specifications for common rail standards, including AREMA, EN, GB, and various crane rails, along with detailed information on the rail clips used to secure them. The dimensions, such as rail height, base width, head width, web thickness, and nominal weight, are fundamental parameters that dictate the load-bearing capacity and performance of the track system.

American (AREMAc Rail Size Chart in mm

The American Railway Engineering and Maintenance-of-Way Association (AREMA) sets the standards for railway infrastructure in North America. These specifications are widely respected and used globally. While traditionally measured in pounds per yard, converting these to metric units is essential for international projects. Below is a rail size chart in mm for common AREMA sections like the AREMA 115, 119, 132, 133, 136, and 147 profiles.

These profiles are designed for heavy-haul and high-traffic mainlines. The variations in head width, height, and web thickness are engineered to handle different axle loads and traffic densities. For instance, the AREMA 136 RE and 141 RE sections are common choices for Class 1 railroads in the United States due to their excellent balance of strength, durability, and cost-effectiveness. The transition to a metric rail size chart in mm facilitates easier collaboration and procurement in a global market.

European (EN) Rail Specifications

European standards, codified under EN 13674, provide a comprehensive framework for railway rails used across the continent and beyond. The UIC (International Union of Railways) profiles are a key part of this standard.

Chinese (GB) Rail Specifications

China’s railway system uses standards defined by the Guobiao (GB) system. These rails support one of the world’s most extensive and heavily used rail networks, including high-speed lines.

Crane Rail Specifications

Crane rails are distinct from standard railway tracks as they are designed to support extremely high wheel loads from overhead cranes, gantries, and port machinery. Their profiles feature a thicker web and a wider head to distribute these concentrated loads effectively. Standards like DIN, YB/T, and JIS are common.

DIN Standard Crane Rails

YB/T (CHN) Standard Crane Rails

Rail Clip Specifications and Dimensions

Rail clips are a critical component of the rail fastening system. Their primary function is to secure the rail to the sleeper or tie plate, preventing longitudinal and lateral movement while absorbing vibrations and providing the necessary clamping force. The design and material of a rail clip are just as important as the rail profile itself for ensuring track stability.

Types of Rail Clips

There are numerous types of rail clips, each designed for specific applications, rail types, and fastening systems. Some of the most common types include:

• E-Type Clips (e.g., e1809, e2007, e2055): These are elastic clips known for their simple design and reliable performance. They are widely used in various track systems worldwide.
• SKL Clips (e.g., SKL1, SKL3, SKL12, SKL14): The “Spannklemme” (tension clamp) series is a German design known for providing a constant and high clamping force. They are often used in high-speed and heavy-haul applications.
• Nabla Clips: This type of clip is used in the Nabla fastening system, offering excellent resistance to rail rollover and good elasticity.
• KPO Clips: A bolted clip system that provides a very secure and rigid fastening, suitable for heavy-duty tracks.

Rail Clip Materials and Properties

The performance of a rail clip is heavily dependent on its material. Most high-performance rail clips are manufactured from spring steel, typically a silicon-manganese alloy, which provides the required elasticity and fatigue strength. Common materials include:

• 60Si2MnA: A standard spring steel with good mechanical properties and fatigue resistance.
• 38Si7: A silicon-manganese spring steel known for its high elasticity.
• 70SiCrA: A higher-grade alloy with chromium added for enhanced hardness and wear resistance.

The manufacturing process involves hot forging, followed by a specific heat treatment (quenching and tempering) to achieve the desired hardness, typically in the range of 42-48 HRC (Rockwell Hardness). This ensures the clip can withstand millions of load cycles without failing or losing its clamping force.

Specifications for Common Rail Clips

Below are the technical specifications for several widely used rail clips.

E-Type Clip Specifications

SKL Tension Clamp Specifications

The selection of a specific rail clip depends on the rail section, the type of sleeper (concrete, wood, or steel), the expected axle loads, and environmental conditions. For example, a hot-dip galvanized or Dacromet finish is often specified for clips used in corrosive environments, such as coastal areas or tunnels. The clamping force and toe load are critical parameters that ensure the rail is held securely under dynamic loads, preventing rail creep and maintaining proper track gauge. A thorough understanding of both the rail profile from a rail size chart in mm and the corresponding fastening components is essential for building a safe and reliable railway.