What is the size of railroad rails?

International Variations in Railroad Rail Size

The size of railroad rails varies significantly across the globe due to historical factors, engineering preferences, and operational requirements. Here’s a closer look at some notable rail size standards:

North America:

In North America, the most common rail profile is the 115RE, which weighs approximately 115 pounds per yard (57.5 kilograms per meter). This profile is characterized by its tall, robust shape and is used on both freight and passenger lines.

Europe:

In Europe, two primary rail standards are prevalent: the 46E1 and the 54E1. The 46E1 rail weighs approximately 46 kilograms per meter, while the 54E1 rail weighs 54 kilograms per meter. Both profiles are lighter and more flexible than the 115RE, but they meet the demands of European rail traffic.

Asia and Other Regions:

In Asia and other regions, a variety of rail sizes are in use. One common designation is the 50kg/m, which refers to a rail profile that weighs approximately 50 kilograms per meter. This profile is often used on light rail and medium-speed rail systems.

Factors Influencing Rail Size:

The choice of rail size depends on several factors, including:

• Traffic Volume: Heavier rail profiles are required for lines that experience high traffic volumes of heavy freight trains.
• Speed: High-speed rail lines typically require heavier rails to withstand the increased dynamic forces.
• Curvature: Curves require rails that are more flexible to prevent derailments.
• Maintenance Costs: Heavier rails tend to have longer lifespans and require less frequent maintenance.

Conclusion:

The size of railroad rails varies globally to accommodate different operational needs and engineering considerations. While North America favors the heavy 115RE profile, Europe utilizes lighter and more flexible 46E1 and 54E1 standards. Asia and other regions adopt a range of rail sizes, including the 50kg/m profile for light rail systems. These variations demonstrate the diverse nature of railway construction and the adaptation of rail infrastructure to meet specific requirements.