Krauss-Maffei M 400 at 9011 at Lenzen Avenue in San Jose, California in August of 1964. Click to enlarge.
(By Drew Jacksich from San Jose, CA, The Republic of California - 9011 at enzen Aug 64, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=17932183)
DIESEL HYDRAULIC LOCOMOTIVES
Modern diesel-electric locomotives use the diesel engine to power an alternator which provides electric power to drive traction motors. A diesel hydraulic locomotive is a locomotive in which the power from a diesel engine is transmitted to the wheels through a hydraulic transmission.