NZR DSB class
|New Zealand DSB class|
In 1950, NZR placed an order for 25 DSB shunting locomotives. They were built by the Drewry Car Co. between 1954 and 1956. The first three DSB class locomotives were commissioned in August 1954. The DSB are a larger and more powerful locomotive than the DS and DSA, classes and were used all over New Zealand. A second batch of three locomotives built by Mitsubishi Heavy Industries was introduced in 1967.
By the end of their lives, 12 DSBs were repainted in the "International Orange" livery.
In line with NZR's policy of rationalising locomotive classes, the DSB class was entirely withdrawn by the end of the 1980s.
Three were purchased for industrial service with DSB 1153 going to New Zealand Milk Products (later subsumed into Fonterra) to shunt their Whareroa milk factory, 1194 to Pacific Steel at Otahuhu scrap plant and 1221 to Avon Engineering at their Kamo plant. DSB 1221 was sold in 1986 while the other two were sold in April the same year. In 1963 all Drewry builds were re-engined with Caterpillar D343TA replacing their National M4AA7 which they entered service with. This increased their power output from 195 kW (260 hp) to 293 kW (353 hp).
Mitsubishi for industry
- Road numbers ORBs 1 and 2
- Maker's Nos 1475 and 1476
ORB 1 was withdrawn in 1989 due to heavier trains and was replaced by DJ 3303. In 1990 the New Zealand Railways Corporation took over the Ohai Railway Boards section of the Wairio Branchline. It was then stored in Wairio until being sold to the Ohai Railway Board Heritage Trust for preservation.
ORB 2 shares a similar operating history to ORB 1, but was withdrawn in 1990. Stored in Wairio until 1992 when it was purchased by Reid McNaught for Steam Incorporated. It was then sold to Richard Gibbard in the early 2000s and is still in service for shunting by Steam Inc.