How Does 136RE Rail Height Influence Track Stability?
The height of the 136RE rail-standardized at 7 5/16 inches (185.74 mm)-is the primary factor in determining its longitudinal stiffness and moment of inertia (94.9 in⁴). This significant height provides superior resistance to vertical deflection under heavy axle loads, ensuring that the rail distributes the weight of the train over more sleepers (ties). This vertical stability prevents ballast crushing, minimizes track geometry degradation, and reduces the risk of derailments caused by rail "waving" or excessive bending.
1. Increased Moment of Inertia and Vertical Rigidity
In engineering, the height of a beam (the rail) exponentially influences its strength.
- The "I-Beam" Effect: By having a height of 7 5/16 inches, the 136RE profile places more steel further from the neutral axis.
- Stability Impact: This results in a high Moment of Inertia, which makes the rail significantly stiffer than shorter profiles (like the 115RE). A stiffer rail remains flatter under the weight of 100+ ton freight cars, maintaining a stable "running surface."
2. Load Distribution and Stress Reduction
The height of the rail acts as a bridge between the locomotive wheels and the track bed.
- Wider Load Path: Because the 136RE is tall and rigid, the downward force of a wheel is spread across 3 to 5 sleepers simultaneously, rather than concentrating the stress on just one or two.
- Stability Impact: This broad distribution protects the ballast and subgrade from "pumping" and settlement, keeping the track stable and level for longer periods between maintenance cycles.
3. Resistance to Rail Deflection (The "Wave" Effect)
When a train moves at speed, a "wave" of deflection travels through the rail.
- Control of Movement: A shorter rail would experience a deep "trough" under each wheel. The 136RE's height limits this vertical movement.
- Stability Impact: Minimizing the wave effect reduces the dynamic impact forces on rail joints and fasteners, preventing the hardware from loosening and ensuring the track maintains its gauge and alignment.
4. Thermal Stability in Continuous Welded Rail (CWR)
Height contributes to the overall mass and cross-sectional area (13.32 in²) of the rail.
- Structural Mass: The physical size of the 136RE profile provides greater resistance to the internal stresses caused by temperature changes.
- Stability Impact: It is less likely to suffer from track buckling (sun kinks) in extreme heat because the taller, heavier section is harder to "push" out of alignment, and it resists pull-aparts in extreme cold due to its high tensile strength.
What Are 136RE Rail Dimensions?
The dimensions of a 136RE rail are a height of 7 5/16 inches (185.74 mm), a base width of 6 inches (152.40 mm), and a head width of 2 15/16 inches (74.61 mm). It features a web thickness of 11/16 inches (17.46 mm) and a total cross-sectional area of 13.32 square inches (85.94 cm²), providing a calculated weight of 136.2 lbs per yard.
136re rail dimensions：
- Total Height: 7 5/16" (185.74 mm)
- Base Width: 6" (152.40 mm)
- Head Width: 2 15/16" (74.61 mm)
- Web Thickness: 11/16" (17.46 mm)
| Profile | Standard | Dimensions mm | Section S | Mass m | ||||
|---|---|---|---|---|---|---|---|---|
| H | B | C | D | E | cm² | kg/m | ||
| American standard | ||||||||
| 136RE (TR68) | AREMA | 185,70 | 152,40 | 74,60 | 49,20 | 17,50 | 85,90 | 67,50 |
Frequently Asked Questions
Q1: What is the standard length of the 136 lb rail, and can it fit into shipping containers?
A: Standard lengths are typically 39 feet (11.89m) to 80 feet (24.38m). For international shipping, we precisely cut the 136 lb rail to 39 feet (approx. 11.8m) to perfectly fit inside standard 40-foot shipping containers for secure and cost-effective maritime transport.
Q2: Does the 136re rail profile require specific joint bars?
A: Yes, the specific web and head angles of the 136re rail profile require exact-matching 136RE joint bars (fishplates). We provide 4-hole or 6-hole joint bars engineered specifically for this profile to ensure seamless track connections.
Q3: How do you guarantee there are no internal cracks inside the 136RE heavy rail?
A: We implement 100% online ultrasonic flaw detection on every single piece of 136RE heavy rail after it leaves the cooling bed. This non-destructive testing ensures zero internal metallurgical defects before shipping.
Q4: Can you provide customized drilling for the arema 136re rail ends?
A: Absolutely. Instead of standard punching, we use CNC multi-spindle drilling machines to drill precise bolt holes according to your exact engineering blueprints, ensuring perfect alignment during installation.
Q5: What is the difference between TR68 and AREMA 136RE rail?
A: There is no physical or dimensional difference. TR68 is simply the naming convention used in some international markets (referring to roughly 68 kg/m ), while it refers to the exact same track section as the AREMA 136RE rail.
Q6: What type of tie plates are compatible with the 136re rail section?
A: Because the 136re rail section features a 6-inch base, it is fully compatible with standard double-shoulder tie plates designed for 6-inch base heavy rails. We can supply the matching tie plates and elastic clips alongside your rail order.
When selecting 136RE rail, understanding detailed 136RE rail dimensions, 136RE rail profile, and application requirements is essential for achieving long-term track performance. With extensive experience in railway products, GNEE RAIL can support your project with optimized rail solutions, precise processing, and reliable delivery.
For detailed drawings, technical consultation, or project-based recommendations, you can contact GNEE RAIL to obtain customized rail solutions and professional support tailored to your needs.
