Input (grade 7): Though similar to the existing Class 08 shunting locomotives, Class 09 were re-geared to give a maximum top speed of 27.5 mph (44 km\/h) at the expense of a lower tractive effort.
Output (grade 8): For this reason, though similar to the existing Class 08 shunting locomotives, Class 09s were re-geared to give a maximum top speed of 27.5 mph (44 km\/h) at the expense of a lower tractive effort.