Dog spikes are utilized for securing rails to the__________________?
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Answer: A. wooden sleepers
Explanation
Dog spikes are traditional headed metal spikes driven directly into timber wooden sleepers. The projecting head of a dog spike grips the rail foot tightly to hold it against the sleeper. Concrete and steel sleepers require specialized fastening clips rather than traditional wooden dog spikes. Timber sleepers provide a resilient foundation into which metallic fastening spikes can be hammered. Dog spikes get their name from the claw shaped head resembling a dog ear. Historic railway construction relied extensively on manual spike driving for quick track assembly.
Heritage railways and older branch lines continue to use timber sleepers secured with dog spikes. Modern high speed railways replace dog spikes with elastic rail clips for superior clamping force. Spike killing occurs when repeated driving loosens the hole in aging wooden sleeper ties. Option B CST-9 sleepers use specialized keys and tie bars rather than standard dog spikes. Option C steel trough sleepers utilize spring steel clips or bolts to secure rail feet. Option D concrete sleepers require cast in shoulders and elastic fastenings to maintain gauge.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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