This weeks article is from the New Zealand Railway Observer Volume 29, No 4, Summer 1972-73 and is:

The “Dx” Class Locomotives Enter Service 

 Article 34, Volume 29, No 4, Summer 1972-73

Each week a new Article from early issues of the New Zealand Railway Observers will be featured. Previous articles can still be viewed via the Publications Tab and then Historical NZRO Articles (the bottom option under this tab).