The London and North Eastern Railway (LNER) was formed out of a number of constituent railway companies at the grouping in 1923. Main companies The main companies, showing their route mileage, were: Great Eastern Railway (GER) miles (1,906 km) Great Central Railway (GCR) miles (1,364 km) Great Northern Railway (GNR) miles (1,680 km) Great North of Scotland Railway (GNSR) miles (535 km) Hull and Barnsley Railway miles (170 km) (H&BR) (which had amalgamated with the NER on 1 April 1922) North British Railway (NBR) North Eastern Railway miles (2,812 km) (NER) Subsidiary companies Independently operated lines Colne Valley and Halstead Railway East and West Yorkshire Union Railway miles (15 km) Mid-Suffolk Light Railway miles (31 km) Leased or worked railways Many of these "railways" existed only in name; there were included on the list at the time of the Railways Act in order to legally qualify each line's position Originally leased to or worked by the NER Brackenhill Light Railway (West Yorkshire) Fawcett Depot line (County Durham) miles (9 km) Great North of England, Clarence and Hartlepool Junction line miles (10 km) Originally leased to or worked by the GCR Humber Commercial Railway and Dock Mansfield Railway North Lindsey Light Railway Seaforth and Sefton Junction Railway Sheffield District Railway miles (7 km) Originally leased to or worked by the GER London and Blackwall Railway Originally leased to or worked by the GNR East Lincolnshire Railway miles (76 km) Horncastle Railway miles (12 km) Nottingham and Grantham Railway and Canal Nottingham Suburban line Stamford and Essendine Railway miles (20 km) Originally leased to or worked by the NBR Edinburgh and Bathgate Railway miles (16 km) Forth and Clyde Junction Railway miles (49 km) Gifford & Garvald Railway miles (15 km) Glasgow and Milngavie Junction Railway miles (5 km) Kilsyth and Bonnybridge railway miles (14 km) (worked jointly with CalR) Lauder Light Railway miles (16 km) Newburgh and North Fife Railway miles (21 km) Originally leased to or worked by H&BR South Yorkshire Junction Railway miles (18 km) Originally leased to or worked by several constituent companies Nottingham Joint Station Committee West Riding and Grimsby Railway miles (52 km) Independently operated joint companies East London Railway: jointly leased by the LNER, Southern Railway, Metropolitan Railway (MetR) and District Railway. Traffic operated by MetR (passenger); LNER (goods) Cheshire Lines Committee (CLC): Operated jointly by LNER/London, Midland and Scottish Railway (LMS). LNER supplies locomotive