On that 2nd one I busted many a knuckle on one of those That is a model Caterpillar 3412 V12. 1649 cu. in. 730 H.P. In the over the Road trucks biggest they got was a 3408 V8, and every trucker that came thru wanted one, it is a Hoss
Seems that I saw these in Vietnam under huge type garages being used as 24 hour generators on our compound. There were 2 of them, one running and the other being serviced (maintenance) mode, then it would be placed back online and the other taken offline for service.
I don't recall that they were ever offline at the same time.