1. What is a railway spike and what is its main function?
A railway spike is a specialized fastener made of high-strength metal for railway tracks. It usually has a pointed lower end, a cylindrical middle part, and a flat or hook-shaped upper end. Its core function is to connect the rail firmly to the sleeper. It prevents the rail from moving horizontally or vertically during train operation. This stable connection is key to avoiding train derailments and ensuring safe operation.
2. What common materials are used to make railway spikes?
Carbon steel is a common material, with high strength and good toughness but poor corrosion resistance. Alloy steel, made by adding elements like chromium, has better hardness and wear resistance than carbon steel. Stainless steel stands out for excellent corrosion resistance due to its chromium content. Each material has pros and cons, fitting different railway environments. The choice depends on factors like cost and environmental conditions.
3. What is a common spike and where is it used?
A common spike, or dog spike, has a simple design with a pointed end and a flat upper end. It is mainly used in traditional wooden sleeper railways. It is easy to install and remove, and its production cost is low. However, its fixation strength is limited. It is not suitable for high-speed or heavy-haul railways with large loads.
4. What is a screw spike and how is it installed?
A screw spike has a threaded surface, similar to a regular screw. It needs to be screwed into pre-drilled threaded holes in the sleeper during installation. This design gives it much higher fixation strength than common spikes. It can firmly lock the rail to the sleeper, providing good stability. It is often used in railways that require higher load-bearing capacity.
5. Are there railway spikes suitable for coastal areas?
Yes, stainless steel railway spikes are ideal for coastal areas. Their chromium content forms a dense oxide film on the surface. This film can resist corrosion from salt in coastal air and seawater. They can maintain good performance even in long-term humid and corrosive environments. Other materials like carbon steel would rust quickly here, so stainless steel is the better choice.