AREMA 136 Rail Profile: Technical Specifications and Applications
Introduction
AREMA 136 (136 RE) is one of the most common rail sections used in North American railways, specified by the American Railway Engineering and Maintenance-of-Way Association (AREMA). It represents a standard profile widely used in freight and passenger operations.
Technical Specifications
Basic Dimensions
- Weight per yard: 136 lb/yd (67.46 kg/m)
- Height: 7″ (177.8 mm)
- Head width: 3″ (76.2 mm)
- Base width: 6″ (152.4 mm)
- Web thickness: 0.725″ (18.4 mm)
- Cross-sectional area: 40.0 sq.in. (258.1 cm²)
Material Properties
- Standard steel grade: AREMA Standard
- Tensile strength: ≥ 125,000 psi (862 MPa)
- Minimum elongation: 10%
- Hardness range: 300-340 BHN
- Yield strength: ≥ 70,000 psi (483 MPa)
Primary Applications
Common Uses
- Class 1 railroads
- Main line tracks
- Passenger routes
- Mixed traffic lines
- Secondary routes
- Industrial tracks
- Transit systems
Operating Parameters
- Maximum speed: Up to 79 mph (127 km/h)
- Axle loads: Up to 33 tonnes
- High traffic density
- Mixed service conditions
Manufacturing Process
Production Steps
- Basic oxygen steelmaking
- Continuous casting
- Hot rolling
- Controlled cooling
- Straightening
- Non-destructive testing
Quality Control
- Chemical analysis
- Mechanical testing
- Ultrasonic inspection
- Surface inspection
- Dimensional checks
Installation Methods
Track Construction
- Continuous welded rail (CWR)
- Jointed rail installation
- Standard tie plates
- Various fastening systems
- Multiple tie options
Fastening Systems
- Cut spikes
- Elastic spikes
- Pandrol clips
- E-clips
- Direct fixation systems
Performance Characteristics
Advantages
- Versatile application
- Good wear resistance
- Proven reliability
- Cost-effective
- Wide compatibility
Design Features
- Balanced section
- Good lateral stability
- Efficient load distribution
- Standard compatibility
- Easy maintenance
Maintenance Requirements
Inspection Protocol
- Regular ultrasonic testing
- Visual inspections
- Wear measurements
- Profile checks
- Joint inspection
Grinding Requirements
- Preventive grinding
- Profile maintenance
- Surface finish specs
- Corrective grinding
- Wear limits
Track Components
Compatible Systems
- Standard tie plates
- Various fasteners
- Joint bars
- Insulated joints
- Special trackwork
Support Structure
- Wood ties
- Concrete ties
- Composite ties
- Ballast specifications
- Subgrade requirements
Service Life
Life Expectancy
- Main lines: 20-30 years
- Secondary lines: 30-40 years
- Industrial: 25-35 years
- Yard tracks: 35-45 years
Influencing Factors
- Traffic density
- Axle loads
- Maintenance practices
- Environmental conditions
- Track geometry
Economic Considerations
Cost Factors
- Initial investment
- Installation costs
- Maintenance requirements
- Life cycle costs
- Replacement intervals
Value Analysis
- Service life benefits
- Maintenance savings
- Installation efficiency
- Material availability
- Standardization benefits
Comparison with Other Profiles
Versus 141 RE
- Lighter section
- Lower initial cost
- Different applications
- Similar installation
- Comparable maintenance
Versus 115 RE
- Heavier section
- Higher capacity
- Better stability
- Different applications
- Cost considerations
Installation Guidelines
Requirements
- Minimum curve radius
- Superelevation limits
- Joint spacing
- Fastening patterns
- Support spacing
Quality Control
- Alignment tolerances
- Surface tolerances
- Gauge requirements
- Cross level specs
- Joint requirements
Environmental Considerations
Sustainability
- 100% recyclable
- Long service life
- Reduced maintenance
- Material efficiency
- Energy considerations
Future Developments
Research Areas
- Material improvements
- Profile optimization
- Installation methods
- Maintenance techniques
- Monitoring systems
Emerging Technologies
- Advanced steel grades
- Improved coatings
- Better testing methods
- Monitoring systems
- Maintenance equipment
Maintenance Practices
Regular Maintenance
- Inspection schedules
- Grinding programs
- Joint maintenance
- Fastener maintenance
- Surface conditions
Repair Procedures
- Welding repairs
- Joint repairs
- Surface defects
- End batter
- Wear limits
Conclusion
AREMA 136 rail remains one of the most versatile and widely used rail sections in North America, offering a good balance of performance, cost, and maintainability. Its widespread adoption and proven track record make it a standard choice for many railway applications.
