you should be a little less demanding,however the diesels are cw60ac. thats what csx called and they were the only ones to buy the 6000 horsepower version. up bought them with the 4400 horsepower to be able to replace the 4400 hp with the 6000 hp if it turned out to be viable,i don't think it did . i beleive csx has downgraded theirs to 4400 at this time.
that being said the only source of this engine is thru World of Trainz at a cost of $5.00.
have a good one
ejb