I was on a small 5000t ship in the 70's, we called in at Capetown for bunkers, and we had to have two tugs , they were both steam, the two together were almost as long as our ship, taking two tugs must have been a port rule, because the ship was all singing and dancing, bow thruster, CP prop.One could have been Hugo or something similar, I remember they were spectacular vessels. Ashore there were still steam loco's as well, equally spectacular. I know at the time I was quite surprised at the reliance on steam, I know steam is reliable, but it seemed old fashioned, as I hadn't been on a steam train in the UK since the early to mid 60's. again in Durban there were also steam tugs, but we didn't take a tug in Durban.
Andy