The QSK78, which is used to power mining industry dump trucks capable of carrying 397 US tons, is a V-18 monster with a capacity of 4760 cu.- in. and uses no less than 12 turbochargers to develop 3500 bhp and getting on for 10,326 lb.- ft. of torque (the original Mini made do with just 59).
Looks very similar to the German v16 MTU engines they now use in the power cars on many HST trains