Based on MaK's 575C design, the locomotives were 10.0 meters (32 ft 10 in) long and had a C wheel arrangement.

All later production was carried out by Thune using prime movers from Bergen Mekaniske Verksted, with a power output of 441 kilowatts (591 hp).

[2] NSB chose to test out the MaK 800D with a power output of 627 kilowatts (841 hp) and a D wheel arrangement.

[3] The second batch of locomotives consisted of three more units built by MaK, numbered 806 through 808, and delivered in 1957.

[3] The main task of the Di 2 was heavy shunting and short-haul freight trains.

[5] Two locomotives, 827 and 829, were repainted and used for the Semsame Train in the children television series Sesam stasjon.

[3] Di 2 854 was in 1997 rebuilt in the Netherlands with a new Caterpillar engine and driver's cab, receiving the new designation Skd 225.

The 1962 series saw the introduction of the heavier Bergen engines and new cabs, increasing the axle load from 15 to 16.5 tonnes.

In the 1980s the Di 2 units were painted the distinct red and yellow shunter colors of NSB.