The diesel-hydraulic locomotive British Rail class 52 Western Champion is seen between two class 50 diesel-electrics on the Severn Valley Railway Stock Photo - Alamy
Diesel hydraulics: Diesels that didn't - Trains
1963 British Railways Western Class Diesel Hydraulic D1015 'Western Champion' – Determined to be Different | Curbside Classic
Diesel-hydraulic locomotive, Western Fusilier | Science Museum Group Collection