↵Rail Dog Spike Fastening System
Dog spikes is functionally equivalent to a cut spike and is also square in horizontal section and of similar dimensions, but has a pointed penetrating end, and the rail head has two lugs on either side, giving the impression of a dog's head and aiding spike removal.
Technical Specifications:
| Parameter | Standard Dog Spike | Heavy-Duty Dog Spike | Treated Wood Spike | Historical Replica Spike |
|---|---|---|---|---|
| Common Size (L×Shank) | 127mm × 16mm sq (5"×5/8") | 140mm × 19mm sq (5.5"×3/4") | 127mm × 16mm sq | Varies (e.g., 140mm) |
| Head Style | Asymmetrical, one "dog ear" | Asymmetrical, reinforced head | Standard asymmetrical | Period-accurate forging |
| Primary Material | Low-C Steel (A36/250) | Med-C Steel (Grade 1035) | Galvanized Low-C Steel | Wrought Iron / Low-C Steel |
| Typical Coating | Hot-Dip Galvanized | Heavy Galvanizing (Z600) | Zinc Chromate or Paint | Black Oxide / Unpainted |
| Weight per Spike | ~0.45 kg | ~0.65 kg | ~0.45 kg | Varies |
| Drive Angle | 45-60 degrees | 50-60 degrees | 45-60 degrees | As per historical practice |
Materials, Manufacturing & Limitations
Forged Carbon Steel Construction: Traditionally hot-forged from A36 or similar low-carbon steel (0.2-0.3% C), providing sufficient toughness and ductility to withstand driving impacts without brittle fracture.
Corrosion Susceptibility: Typically supplied with a basic hot-dip galvanized or painted coating. The inherent design creates crevices under the head where moisture and debris accumulate, accelerating corrosion in the critical load-bearing zone.
Wood-Dependent Performance: Efficacy is entirely dependent on the quality, density, and condition of the wooden sleeper. Performance degrades with sleeter decay, splitting, or wear ("crib wear").
Modern Context & Niche Applications
- Heritage and Secondary Line Role: Remains in service primarily on historic railways, museum lines, low-traffic branch lines, and in some industrial sidings where modernization is not economically justified.
- Temporary and Construction Applications: Used for temporary track installations, construction site trackage, and as a robust, simple fastener in scenarios where tracks are frequently relocated.
- Performance Ceiling: Fundamentally limits allowable axle loads and operating speeds (typically below 40-65 km/h for passenger, higher for slow freight) due to its limited grip and tendency to work loose under dynamic loads.
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