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2. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   The trailer tongue (North America) or coupling (outside North America) slips over a trailer hitch ball attached to a receiver hitch mount or integral with the hitch. A larger, heavy-duty gooseneck ball size: 3 in (76.2 mm) is typically used for towing greater than 10,000 pounds (4.5 t), and this towing capacity falls outside of the scope of SAE ...

3. ISO standards for trailer connectors - Wikipedia

   en.wikipedia.org/wiki/ISO_standards_for_trailer...

   There are two main variants of the wiring with a switchover date 1999. The difference is that an additional connection for ground and that battery charging in the trailer is shared with other consumers. This means that if a pre-1999 camper trailer with a battery is connected to a post 1999 vehicle there's a risk that the battery charging won't ...

4. Three-point hitch - Wikipedia

   en.wikipedia.org/wiki/Three-point_hitch

   The three-point hitch (British English: three-point linkage) is a widely used type of hitch for attaching ploughs and other implements to an agricultural or industrial tractor. [ 1 ] [ 2 ] The three points resemble either a triangle, or the letter A.

5. Drawbar (haulage) - Wikipedia

   en.wikipedia.org/wiki/Drawbar_(haulage)

   A drawbar eye, also called tow eye, is a mechanical part to connect an independent trailer/dolly via a drawbar coupling to a tractor. [2] the eye is connected to the front end of a drawbar with bolt, flange-mounting or welding. [3] Most are made from high tension material to bear heavy loads while being pulled by the tractor.

6. Roadrailer - Wikipedia

   en.wikipedia.org/wiki/Roadrailer

   Side view of a Roadrailer's dedicated regular truck showing the connection between two trailer bodies. This image shows only one fifth wheel. Northbound Roadrailer at Fields, July 1998. The advantage of using roadrailers was their ability to be used directly behind other freight (or even passenger) equipment without the use of trailer flatcars.

7. Interlocking - Wikipedia

   en.wikipedia.org/wiki/Interlocking

   For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first. In North America, the official railroad definition of interlocking is: " An arrangement of signals and signal appliances so interconnected that their movements must succeed each ...

8. Twistlock - Wikipedia

   en.wikipedia.org/wiki/Twistlock

   The hole is an oval 4.9 in (124.5 mm) on the long axis with two flat sides 2.5 in (63.5 mm) apart. The male component is the twistlock, which is fitted to cranes and transport bases. This can be inserted through the hole (it is roughly 4.1 in or 104.1 mm long and 2.2 in or 55.9 mm wide), and then the top portion (normally pointed to make ...

9. Interlock (engineering) - Wikipedia

   en.wikipedia.org/wiki/Interlock_(engineering)

   Power cannot be re-applied to the kiln until the kiln door is locked, releasing the key, and the key is then returned to the disconnecting switch interlock. [1] A similar two-part interlock system can be used anywhere it is necessary to ensure the energy supply to a machine is interrupted before the machine is entered for adjustment or maintenance.