Nokia Corporation () (, , ) is a Finnish multinational communications corporation headquartered in Keilaniemi, Espoo, a city neighbouring Helsinki. Its principal products are mobile electronic devices, primarily and other communications devices. It also offers Internet services such as applications, games, music, maps, media and messaging through its Ovi platform, and free-of-charge digital map information and navigation services through its wholly owned subsidiary Navteq. Nokia has a joint venture with Si..
A coupling (or a coupler) is a mechanism for connecting rolling stock in a train. The design of the coupler is standard, and is almost as important as the track gauge, since flexibility and convenience are maximised if all rolling stock can be coupled together.
