The Dortmund factory designed and built many legendary hydraulic mining shovels, including the RH200, RH300 and RH400, the largest serial production hydraulic shovel produced to date. Here through a wide selection of images and informative text the technical details of O&K, Terex and Bucyrus hydraulic mining shovels are thoroughly explored. Learn how the RH200¡¯s main and swing hydraulic systems worked and on which machine serial number innovative technical changes such as CMS were first installed, as well as the benefits of TriPower, why O&K favoured twin-engined operation and numerous on-site hourly production rates.

Ex-Dortmund employee Rob Sinclair provides an unparalleled insight into these machines with many previously unpublished photographs.