The germans tried that in the 60s see https://en.wikipedia.org/wiki/Otto_Hahn_(ship). It was uneconomical. You need specialized engineers for that, you need special permissions for ports and the important canals are off limits due to risk.
The germans tried that in the 60s see https://en.wikipedia.org/wiki/Otto_Hahn_(ship). It was uneconomical. You need specialized engineers for that, you need special permissions for ports and the important canals are off limits due to risk.