1. What is the standard length of railway rails?
The standard length of conventional rails is 25 meters, but in continuous welded rail (CWR) tracks, they can be welded into sections hundreds of meters or even kilometers long. Short rails are mainly used in station tracks or turnout areas. Long rails reduce the number of joints, minimizing wheel-rail impact and noise.
2. What are the features of a rail's cross-sectional shape?
The rail cross-section consists of three parts: the head, web, and foot. The head contacts the wheel and must be wear-resistant; the web withstands bending stress; and the foot provides stability. Common cross-sectional profiles include UIC60 (Europe) and CHN60 (China), with dimensions and curves precisely calculated for optimal stress distribution.
3. How is rail wear detected?
Detection methods include:
Ultrasonic testing: Checks for internal cracks and defects.
Laser measuring devices: Measure head wear (replacement required if vertical wear exceeds 6mm).
Manual inspection: Identifies surface damage like spalling or crushing.
4. What is the rail installation process?
Lay and align sleepers.
Position rails and temporarily secure them.
Fasten with clips (e.g., elastic rail clips, bolts).
Adjust gauge, level, and alignment.
5. What anti-corrosion measures are used for rails?
Anti-rust coatings: For humid regions.
Stainless-clad rails: Costly, used in extreme environments.
Regular cleaning: Prevents rust buildup.