The first three locomotives were delivered in 1931, numbered in the range from NG17 to NG19, followed by three more in 1939, numbered in the range from NG117 to NG119.
The first three locomotives were delivered in 1931 from NG117 to NG119. The first three locomotives were numbered in the range from NG17 to NG19 from NG117 to NG119. The first three locomotives were followed by three more in 1939 from NG117 to NG119. The first three locomotives were numbered in the range from NG117 to NG119.