Seattle's MARCO shipyard has been completing a rush job for Great Lakes Towing affiliate TUGZ International and is expected to have three new tractor tugs ready for christening by February 13. At the same time, the yard has just started to cut steel for two slightly larger tractors being built for San Francisco-based BayDelta. The latter will measure 105 ft. and will be powered by twin Caterpillar diesels of 4,400 combined hp driving Ulstein Z-drive units fitted with high-performance Nautican nozzles. Towing winches and headline winches will be provided by Burrard Iron Works Ltd of Vancouver, B.C. The three TUGZ boats, to be christened Z-Three, Z-Four and Z-Five, are 95-ft., and will also make use of Caterpillars turning Ulstein z-drives.