The Brunswick State Railway Company (Braunschweigische Landes-Eisenbahn-Gesellschaft) or BLE was a railway company in the Duchy of Brunswick, a former German state centred on the city of Brunswick (German: Braunschweig).
It was founded on 27 June 1884 by the Frankfurt bank of Erlanger & Söhne and Gebrüder Sulzbach with the aim of building and operating railways of secondary importance in the Duchy of Brunswick and the adjoining territories.
The Brunswick State Railway Company is not the same as the Duchy of Brunswick State Railway or the Brunswick Railway Company which did not exist when the BLE was founded.
In its first two decades it built a total of 108 kilometres of standard gauge railways. They provided rail access for about 50 commercial firms and around one hundred warehouses in the city of Brunswick using a ring railway. The BLE lines also opened up the largely agricultural areas around this Residenz city as far as the foothills of the Harz. In this area the transportation of potash, which was mined there, played an important role for the railways and continued to do so until the 1920s.
The departure point for the Brunswick–Derneburg railway, the first BLE line, built on 18 July 1886, was Braunschweig Nord railway station, where the management and centre of operations was based. From here it ran to Braunschweig West (Wilhelmithor) and southwards to Hoheweg, where on 17 October 1886 a 4 km long branch to Wolfenbüttel turned off. The main line swung westwards and reached Derneburg station on the Hildesheim–Goslar railway via Lichtenberg and Osterlinde in what later became the Salzgitter industrial estate.
In the years that followed the Derneburg–Seesen railway from Derneburg – which again ran southwards – reached Bockenem in the Nette valley on 27 May 1887, Groß Rhüden on 1 October 1887 and finally the railway hub of Seesen on 1 May 1889. Apart from the construction of the northern section there was now a pause of about a decade. During this time the network was expanded with short link lines – some only for goods traffic – on 1 September 1886 from Braunschweig West station to the Hauptbahnhof and by turning the BLE stations into state railway stations on 1 January 1890 at Seesen and on 20 September 1890 at Wolfenbüttel.