NZR D class (1929)
The NZR D class of 1929 comprised one 0-4-0 tank locomotive that was built for the New Zealand Railways Department by the Clayton Wagons Ltd in Lincoln, England. History 
Originally, D 1 was purchased for railcar type service but it was not successful. It had a White-Forster type boiler designed for a working pressure of , had four vertical cylinders housed in the rear of the cab and was high geared. At a normal engine speed of 400 rpm, the unit was calculated to develop . The engine drove a central transverse jackshaft through reduction gearing, the drive from the jackshaft being transmitted to the wheels through conventional side rods. Working Life 
On arrival in New Zealand, D 1 was found to be more than 25 percent heavier than the specified maximum of  and after trials in Wellington was allocated for use as a shunting engine at the Otahuhu workshops. However it never proved satisfactory and was written off in 1936 and scrapped and  D 1 did not survive to be preserved. Notes and references

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D
Scrapped locomotives
Railway locomotives introduced in 1929
3 ft 6 in gauge locomotives of New Zealand