This weeks article is from the New Zealand Railway Observer Volume 30, No 4, Spring 1973 and is:

Wind and Railway Engineering – A.L.R. Merrifield discusses some aspects

 Article 41, Volume 30, No 3, Spring 1973

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).