In summer 1938, a miniature railway was opened on the lower section of DZG.
Costing £2,000 the tiny locomotive took its first journey in June and was built by G& S Light Engineering, of Stourbridge, with the two engines named Lady Sonia and Sir Richard.
The mile-long track ran through a wooded area from the Brown bear ravine to the Castle Hill Tecton entrance and carried up to 150 people at a time on 10 small coaches.
The railway also included miniature platforms, bridges and a signal system and ran for more than four decades.
The railway system and its two coal-fired model engines, each weighing two tons, were controlled by retired Great Western Railway drivers, Frank Bellamy and Harry Rempton.
CAPTIONS: TOP and ABOVE: Visitors enjoy a ride on the miniature railway which ran at DZG until the early 1990s.
RIGHT: One of two elephants that were a gift from the Maharajah of Mysore when the zoo opened in May 1937, takes a close look at the newly installed train.