The 25NC #3483 named Katy is resting at the De Aar shed. Along with the Class 25NC, ninety Class 25 condensing locomotives were built as part of the same order, one by Henschel and the rest by NBL. The condensing apparatus for these engines and their condensing tenders were designed and patented by Henschel. Between 1973 and 1980, all but three of the ninety Class 25 condensers were converted to non-condensing locomotives and reclassified to Class 25NC. In the process, their condensing tenders were also rebuilt to ordinary coal-and-water tenders by removing the condensing radiators and roof fans and replacing it with a massive water tank. Since the condensing tenders were built on single cast steel water-bottom frames it was impractical to attempt to shorten them, which resulted in the rebuilt tenders with their long round-topped water tanks. Locomotives with these rebuilt tenders were soon nicknamed Worshond (Sausage dog or Dachshund). One of these tenders can be seen on the right of the picture.
