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2. Coil spring - Wikipedia

   en.wikipedia.org/wiki/Coil_spring

   Metal coil springs are made by winding a wire around a shaped former – a cylinder is used to form cylindrical coil springs. Illustration of various arc springs and arc spring systems (systems consisting of inner and outer arc springs). Coil springs for vehicles are typically made of hardened steel. A machine called an auto-coiler takes spring ...

3. List of railroad truck parts - Wikipedia

   en.wikipedia.org/wiki/List_of_railroad_truck_parts

   An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.

4. Clutch - Wikipedia

   en.wikipedia.org/wiki/Clutch

   The clutch consisted of a wrap-spring clutch-brake that was coupled to the rotor by one or two stages of reduction gearing. The clutch-brake locked up when rotated backwards, but also had some spring action. The inertia of the rotor going backwards engaged the clutch and wound the spring. As it unwound, it restarted the motor in the correct ...

5. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   Zero-length spring is a term for a specially designed coil spring that would exert zero force if it had zero length. That is, in a line graph of the spring's force versus its length, the line passes through the origin. A real coil spring will not contract to zero length because at some point the coils touch each other.

6. Buffer (rail transport) - Wikipedia

   en.wikipedia.org/wiki/Buffer_(rail_transport)

   The first ones consisted of a steel rod that carried the buffer plate at one end. The buffer rod pushed backwards on a spiral volute spring (coil spring), which was supported by a strong sheet metal cylindrical sleeve. Compressing the spring absorbed the impact. The first spring-loaded buffers were invented by John Baillie in 1846. [3]

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