July 24, 2020 Main Iron Works wins repeat tug order from Bisso Written by Baird Maritime on July 24, 2020. Posted in Commercial Mariner - Tugs & Towage, Inland Tug Operations. Louisiana-based Main Iron Works has won an order for a new ASD tractor tug from Bisso Towboat. The tug will be powered by two Caterpillar 3516E 2,240kW EPA Tier .. Read More