3D Class, Japanese Cargo Ships

Specifications:

Tonnage	3000 gross register tons 4700 deadweight tons
Dimensions	342'0" by 46'11" by 20'0" 104.24m by 14.30m by 6.10m
Maximum speed	14.5 knots
Range	4000 nautical miles (6400 km) at 12 knots

The 3Ds were standardized cargo vessels. They were designed for mass production rather than commercial economy, like the American Liberty Ships. However, they were a bit sturdier and faster than the 2Ds, which made them a bit less vulnerable to submarines.

Only one of these ships was launched in 1945 before the surrender.

References:

Heal (2003)

Jentschura, Jung, and Mickel (1977)