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The NSB type 18 was a 2'C (4-6-0) built between 1900 and 1919 by Sächsische Maschinenfabrik and Hamar Jernstøberi for the Norwegian state railway (NSB).

History
The type 18 was originally intended for the Nordbanen, but could be found on most lines in Norway. 35 of this type were built in as subtypes 18a, 18b and 18c, of which the latest model c was somewhat heavier and had a larger cylinder diameter. The early types, 18a and 18b, were later upgraded to c-standard. The Type 18 had around 825 horsepower and a service weight of 81 tonnes including the tender as well as a top speed of 65 km/h. As rail traffic picked up, these machines were replaced by more powerful locomotives. A total of 35 locomotives were built. 18a nos. 131 to 138 were built in Germany by the Sächsische Maschinenfabrik, the remaining locomotives by Hamar Jernstøberi.

NSB Type 18a
The saturated compounded locomotives of type 18a were used on the northern railways Røykenvikbanen (Jaren - Røykenvik), Gjøvikbanen (Grefsen - Gjøvik) and Skreiabanen (Reinsvoll - Skreia). The first eight locomotives nos. 131–134 were built by the Sächsische Maschinenfabrik in 1900, nos. 135–138 followed in 1901 and nos. 157 and 158 were built by Hamar Jernstøberi in 1903. Eight of the ten locomotives, with the exception of nos. 135 and 157, were later fitted with superheaters and simple expansion and were re-designated as the type 18c. Locomotive no. 138 was displayed at the Paris World Exhibition in 1900.

NSB Type 18b
The Type 18b were saturated compounded locomotives as well, built by Hamar Jernstøberi in 1907. The six locomotives were intended for use in the area around Gjøvik and for the Bergensbane. They had road numbers 184 to 189. The locomotives were based in Bergen, Hamar, Trondheim, Kristiansand and Arendal. They were also used on the Eidsvoll - Otta and Otta - Dombås sections of the Dovre line. No. 184 was rebuilt onto an 18c in 1938 and No. 186 in 1948. A these two engines were withdrawn in 1962.

NSB Type 18c
The type 18c was slightly heavier than the previous types and had an enlarged cylinder diameter. No compounding was used on the 18c, and was originally built superheaters. They were also built by Hamar Jernstøberi. They were later replaced by more powerful locomotives in mainline service and were put on branch line services. No. 134 was the oldest type 18c in service from 1964 until it was withdrawn in 1968.

Preservation
The last NSB type 18c no. 255 locomotive built in 1913 by Hamar Jernstøberi was withdrawn on 25 August 1969 and has since been preserved by the Bergen Technical Museum. This locomotive was restored in from 1980 to 1992 by the Norsk Jernbaneklubb and is in service at the Gamle Vossebanen where it is in operation every summer. no. 255 was originally allocated to the Eidsvold – Ottabanen, but was reallocated to the Drammen, Oslo and Trondheim districts, where after the latter it ran the line between Grong and Namsos.