1. What is rail skidding and how is it prevented?
Skidding occurs when wheels lock during braking, causing flat spots on rails. Solutions include anti-lock braking systems (ABS) and friction modifiers. Damaged sections require grinding.
2. How do you inspect rails for internal defects?
Ultrasonic testing (UT) carts emit high-frequency waves to detect subsurface cracks. Eddy current testing supplements UT for surface flaws. Data is analyzed in real-time with AI algorithms.
3. What are the effects of wheel burn on rails?
Wheel burn (thermal cracks) results from prolonged wheel slippage. It creates hardened zones prone to spalling. Repair involves grinding below the affected layer or localized welding.
4. How are rails marked for traceability?
Laser engraving stamps each rail with:
Manufacturer code
Production date
Steel grade
Heat number
This enables quality tracking throughout its lifecycle.
5. What innovations exist in rail materials?
Bainitic steel: 30% longer life than pearlitic rails.
Composite rails: Carbon fiber sections for lightweight bridges.
Self-healing coatings: Microcapsules release anti-corrosion agents when scratched.