1. What are the safety protocols for spike driving?
Hearing protection (110dB impact noise)
Safety glasses (flying metal fragments)
Gloves with vibration damping
Steel-toe boots
Two-person teams for manual driving
2. How are spikes marked for different track classes?
Color coding system:
White paint: Main lines (Class 4-5)
Yellow paint: Secondary lines (Class 2-3)
Red paint: Yard tracks (Class 1)
Helps inspectors prioritize maintenance.
3. What causes spike shank bending?
Bending occurs from:
Lateral track forces in curves
Tie rot reducing support
Improper extraction attempts
Bent spikes lose 60-80% of holding capacity.
4. How do you measure spike withdrawal resistance?
Using a hydraulic pull tester:
Attach clamp to spike head
Apply gradual upward force
Record peak force before movement
Minimum standards:
Wood ties: 3.5kN
Concrete: 5.0kN
5. What are the maintenance intervals for spike inspection?
| Track Class | Inspection Frequency |
|---|---|
| Class 5 (Mainline) | Monthly |
| Class 3 (Branch) | Quarterly |
| Class 1 (Yard) | Annually |
| High-speed lines require weekly visual checks. |