What Are the Key Features of 136 lb Rail?
Direct Answer: The key features of the 136 lb (136RE) rail include its 7 5/16-inch height for superior vertical stiffness, a 6-inch wide base for lateral stability, and a massive 13.32 in² cross-sectional area. These features provide a high Moment of Inertia (94.9 in⁴), allowing the rail to safely support heavy axle loads of 315,000 lbs while resisting wear and fatigue over long service life.
1. Robust Physical Dimensions for High Loads
The 136RE profile is engineered to handle the extreme stresses of modern heavy-haul railroading:
- Height (7 5/16"): This provides the longitudinal stiffness necessary to prevent excessive "waving" or deflection under the locomotive.
- Base Width (6"): A wider footprint distributes the train's weight more effectively to the sleepers, preventing rail rollover on curves and reducing ballast pressure.
- Web Thickness (11/16"): A reinforced web ensures the rail can withstand high internal shear stresses without developing cracks or fissures.
| 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 |
2. Exceptional Vertical Stiffness (Moment of Inertia)
One of the most critical engineering features is its Moment of Inertia (Ix) of 94.9 in⁴. This makes the 136 lb rail approximately 45% stiffer than the 115 lb rail. High stiffness is essential because it:
- Protects the track bed by spreading the load across multiple sleepers.
- Minimizes track geometry degradation, leading to lower maintenance costs.
3. Substantial Wear Volume in the Rail Head
The 136RE profile allocates a large volume of steel to the head. This "wear allowance" is a vital feature for mainlines with high traffic frequency:
- Multiple Grinding Cycles: The extra steel allows for frequent rail grinding and reprofiling to remove surface defects like Rolling Contact Fatigue (RCF).
- Longevity: It ensures the rail can stay in service for decades, even on lines carrying hundreds of millions of gross tons (MGT) annually.
4. Heavy Axle Load (HAL) Optimization
Modern North American logistics often utilize cars with a gross rail load of 315,000 lbs. The 136 lb rail is the industry standard for these loads because:
- Its mass is optimized to absorb the dynamic impact of heavy freight at speeds up to 70 mph (113 km/h).
- It maintains structural integrity under constant, high-tonnage cycling.
Frequently Asked Questions (FAQ)
Q1: What are the standard delivery lengths for the 136 lb rail?
A: Common standard lengths include 39 feet (11.89m), 78 feet, and 80 feet. To optimize international maritime logistics, we accurately cut rails to 39 feet to ensure they fit securely inside standard 40-foot shipping containers.
Q2: Does the 136re rail section require specific tie plates?
A: Yes. Because the rail base is exactly 6 inches wide, you must use standard double-shoulder tie plates specifically designed to accommodate a 6-inch heavy rail base for proper seating and clamping.
Q3: Can you drill the bolt holes according to our project blueprints?
A: Yes. We utilize precision CNC multi-spindle drilling machines to pre-drill the exact bolt hole configurations at the rail ends according to your specific engineering drawings.
Q4: Are standard fishplates compatible with the 136re rail profile?
A: No. Due to the specific web thickness and head angles, you need matching 4-hole or 6-hole joint bars that are forged specifically for the 136re rail profile to ensure a flush, secure connection.
Q5: Is there any dimensional difference between AREMA 136RE and TR68 rail?
A: There is no physical or structural difference. TR68 is simply the metric naming convention used in some global markets (indicating approximately 68 kg/m ), while referring to the exact same track section.
When selecting 136RE rail, understanding the 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. By operating our own steel rolling lines, CNC drilling centers, and physical testing laboratories, we maintain strict control over exact chemical compositions and dimensional tolerances. This allows us to provide uncompromised product quality, precise processing, and reliable delivery for your track construction or renewal programs.
For detailed drawings, technical consultation, or project-based recommendations, you can contact us to obtain customized rail solutions and professional support tailored to your needs.
