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Rail Dog Spike Fastening System
A Railway Dog Spike is a cut-spike fastening device characterized by its J-shaped head profile and tapered rectangular cross-section, forged from low-carbon steel via hot heading and roll-forming processes. It functions as a positive mechanical anchor driven through punched holes in flat-footed rails or baseplates into untreated or creosoted timber sleepers. The spike's head geometry features a 75-degree rail-bearing surface that matches the rail foot inclination, creating a wedging action that resists lateral track displacement while allowing vertical lift under extreme wheel loads.
Technical Specifications:
| Feature Category | Key Benefit | Common Application |
|---|---|---|
| 1:20 Angled Head | Matches rail inclination for full contact | Main line wooden sleeper tracks |
| Rectangular Shank | Prevents rotation under lateral loads | Sharp radius curves |
| Chisel Point | Splits wood fibers minimally during driving | Dense hardwood sleepers |
| Creosote Compatibility | Natural waterproofing at spike-wood interface | Heritage & preserved railways |
| 2,000-4,000 lb Withdrawal | Quantifiable holding power for engineering | Branch lines & industrial spurs |
| Pneumatic Driver Ready | High-speed mechanized installation | Track renewal projects |
Installation & Maintenance Perspective:
- Rectangular shank cross-section provides greater resistance to rotation than round equivalents.
- Head undersurface angled at 1:20 or 1:40 to match typical rail foot inclination.
- Chisel-point termination facilitates wood fiber separation rather than cutting during driving.
- Shank taper ratio optimized for withdrawal resistance without excessive wood splitting.
- Head overhang dimension critical for proper rail foot engagement without overdriving risk.
Maintenance & Operational Perspective
- Installed using double-faced spike mauls weighing 8-12 pounds for manual track construction.
- Pneumatic spike drivers deliver controlled impact energy preventing head deformation.
- Automated spike pullers utilize scissor-action jaws engaging beneath the head shoulder.
- Driving pattern follows specific sequence: gauge side first, then field side, alternating sleepers.
- Countersinking below rail head surface indicates overdriving, reducing holding capacity.
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