My first look at a diesel was in the engine room of USS Nereus, a Fulton-class sub-tender. I recall that the ‘ultimate’ emergency shutdown method for a run-away engine was to stick the ‘horn’ of a Carbon-Dioxide fire extinguisher in the intake duct of the engine and… WHOOSH, which would shutdown the engine and also radically change the clearances in the roots blower. There were six engines in each engine room, two 12-278s for ships service and four 16-248s for main propulsion (one later converted to ships service), if I remember correctly.