Norwegian coupling

Norwegian coupling fitted to an ex-WDLR Alco from the Froissy Dompierre Light Railway

Norwegian coupling in Uganda

A Norwegian coupling or meat chopper is a manual coupling consisting of a central buffer with a mechanical hook that drops into a slot in the central buffer. The system is only found on narrow gauge railways of 1,067 mm (3 ft 6 in) or less, such as Western Australian Government Railways, the Ffestiniog Railway and the Welsh Highland Railway, where low speeds and reduced train loads allow a simpler system. Norwegian couplings are not particularly strong, and may be supplemented by auxiliary chains. Not all Norwegian couplings are compatible with one another as they vary in height, width, and may or may not be limited to one hook at a time.

The New Zealand Government Railways, during the 1970s, developed an extremely large and heavy-duty version of the chopper coupler. These were first applied to a fleet of General Electric locomotives (U26C class DX), which had arrived from the United States with auto couplers. However, they were converted once it was decided that these locomotives would operate on other than just the North Island Main Trunk express freight trains. On railway lines where rolling stock always points the same way, the mechanical hook may be provided only on one end of each wagon. This was the situation on the Lynton & Barnstaple (L&B), a narrow gauge line in Devon, England, and still applies to railways in New Zealand. Similarly, the hand brake handles may also be on one side of the wagons only. The L&B originally used side chains in conjunction with Norwegian couplers, but these were found to be unnecessary with the slow speeds employed (15–25 km/h/9–16 mph) and were removed within a year or so of the line opening in 1898.

The Pichi Richi Railway in South Australia uses Norwegian couplers as its standard, and converts Janney coupler to Norwegian as required. The slot in the "buffer beam" where the coupler protrudes appears to be about the same for both types of couplers. As a museum, it is appropriate to use the older type of coupling.

See also

• Coupling (railway)
• Janney coupler
• Tightlock coupling