NSB Class IV

The NSB (Norwegian State Railways) Class IV (as in the number four, or "fire" in Norwegian) or "Tryggve" Class was a class of narrow gauge steam locomotives built by Beyer-Peacock and in Manchester and typical of that company's designs, strongly resembling the Manx Peacock locomotives for the Isle of Man. Built 1866–1883.
Further reading.
Bjerke, Thor; Hansen, Trond B.; Johansson, Erik W.; Sando, Svein E. (1987). Damplokomotiver i Norge. Norsk Jernbaneklubb. s. 222–224, 232–233. .