Spoorijzer N.V., or shortened SIJ for NV Spoorwegmaterieel en IJzerconstructie, was a narrow gauge railway manufacturer in Delft, Netherlands.
The company was set up on 4 November 1912 as J.C. Goudriaan's Industrie- en Exportmaatschappij. [1]
The company built in the 1950s approximately 100 "Rail Tractors" which were commonly used in brick factories to replace horses. [2] In total about 160 narrow rail locomotives were built. [1] The last remaining SIJ buildings were closed after several re-organisations in 1977. [3]
The company also imported locomotives from Ruston & Hornsby, for use within the Netherlands and its colonies. [4]