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Narrow 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.

National Railway Museum (NRM)
The National Railway Museum in York is part of the National Museum of Science and Industry.

Neasden Works
Main works for the former Metropolitan Railway in London.

Neath & Brecon Railway
Absorbed into Great Western Railway 1 July 1922.

Neilson, Reid & Co.
Locomotive builders based at the Hyde Park Street Works in Glasgow. Manufacturing began in 1843 and the company was merged with others to form the North British Locomotive Company in 1903.

Nene Valley Railway
A standard gauge preserved railway in Peterborough.

Nine Elms Works
Main works for the former London South Western Railway.

Nondescript Coach
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.

Normal (referring to signal or points levers)
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 (see also reversed).

North British Locomotive Company
Former in 1903 by the merger of three Glasgow locomotive builders; Sharp Stewart & Co, Dubs & Co and Neilson, Reid & Co. At it's peak the company had over 8000 employees and the works covered 60 acres. The company suffered greatly from the demise of steam and had little success with building diesels, finally closing in 1962.

North British Railway
This railway was incorporated in 1844, to run from Edinburgh to Berwick-upon-Tweed. It later absorbed several other small lines and in 1908 merged with the West Highland Railway to become one of the most extensive and far-reaching railways in Scotland. Its total mileage eventually reached 1241 and included routes to Mallaig, Inverness-shire; Silloth, on the Solway Firth; and Hexham, on the Newcastle and Carlisle section of the North-Eastern Railway. It was absorbed into the London & North Eastern Railway at the 1923 grouping.
Archie Noble has some more information.

North Downs Steam Railway
A former railway preservation society which was developing a green field site near Dartford in Kent. It unfortunately closed down in December 1995 due to the extremely high level of vandalism suffered. The society has now merged with the Spa Valley Railway.

North Eastern Railway
This was a very prosperous and efficient railway, formed in 1854 by the merger of the York, Newcastle and Berwick; the York and North Midland; the Leeds Northern and the Malton and Driffield. Other companies were absorbed later, notably the Newcastle and Carlisle in 1862, and the Stockton and Darlington in 1863. As well as forming part of the East Coast Route from London to Edinburgh the NER included important lines around Hull and the coastal towns of East Riding. It was also a major mineral carrier, mainly short hauls from the collieries in Northumberland and Durham to nearby ports. It was absorbed into London & North Eastern Railway at the 1923 grouping.

North London Railway
Worked by London North Western Railway from Dec 1908, it was eventually absorbed into London, Midland & Scottish Railway. Its original route was from the London North Western Railway at Camden to the West India Docks, Blackwall. Subsequent extensions and connecting lines enabled it to cover much of the northern and eastern suburbs of London. It also had junctions with the LNWR, Midland, Great Northern, Great Eastern, London Tilbury and Southend, and Great Western.

North Norfolk Railway
A standard gauge preserved railway in Norfolk.

North of England Open Air Museum
The 200 acre site at Beamish, County Durham, recreates life around the turn of the century and includes a railway station and some very old locomotives.

North Staffordshire Railway
This was an important and prosperous local railway in the Potteries district, and also an important connecting link in the popular alternative route from London to Manchester, via Stoke-on-Trent and Macclesfield. It was absorbed into the London, Midland & Scottish Railway in July 1923.

North Woolwich Old Station Museum
A standard gauge railway museum in London.

North Yorkshire Moors Railway
A standard gauge preserved railway in North Yorkshire.

Northampton & Lamport Steam Railway
A standard gauge preserved railway in Northampton.

Notching Up
See entry for `cut-off' for a steam engine.
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.