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The Track width of N Gauge is 9mm.
See also: Gauge.
Any railway of less than the UK standard gauge of 4 foot 8½ inches. Commonly used for industrial sites and particularly in Wales for use in and around slate mines. Ireland also has many 3 foot gauge lines in rural areas.
Coach prepared to first-class seating standards, but able to be re-classified as another class. Often used on Southern Railway Boat trains, where seating was required in different proportions of first, second and third class, depending on the individual ship's accommodation. Class was indicated by removable metal plates on the doors. This was particularly useful in the case of second class, since these were the only trains to convey this classification of passenger. q.v. Unclassified.
The position of a signal or points lever when it is pushed forward, or in the centre position, in its frame. The normal position indicates that the signal is on, or that the points are set for the more commonly-used route.
For electric locomotives and multiple units notching up describes the process of increasing the voltage on the traction motors in steps. This can be done manually or automatically.
See: Cut-Off for a steam engine.