Pedantic comment: in the era shown they were pushed by steam tugs. Towing came with diesel tugs.
Official name: Compartment boats.
Does that level of pedantry require a special beige cardigan?
Impressed all the same that people know this stuff. Knowledge only works if people know it.
Doh! Just enjoyed the ride. As usual forgot the pictures
Schrödingers bike ride: if you don't have pictures, did it happen?