https://ift.tt/2wwdHAe In Ports Everywhere, It’s Push Versus Pull Tugboats and Towboats, Maritime Accidents and Safety It’s more efficient for tugboats to nudge barges along, but some conditions require that the loads be towed. C. CLAIBORNE RAY https://ift.tt/2D0FmLc November 5, 2018 at 05:30AM

By C. CLAIBORNE RAY from NYT Science https://ift.tt/2F1jq5y