41. To obtain increased tractive effort with the large coupled wheels , larger cylinders of bore by stroke were used. 42. Soft grease lubrication was used for the motion, while the coupled wheel axle boxes were hard grease lubricated. 43. These locomotives were the first in South Africa to be equipped with compensated spring gear on all coupled wheels . 44. Despite the relatively small diameter coupled wheels , a speed of was reached with the same load on level track. 45. These straight frames were less prone to fracturing, because of the greater depth of plate between the coupled wheels . 46. This problem was alleviated to a great extent by ensuring the diameter of all coupled wheels was very closely matched. 47. The eccentrics were fitted to the trailing coupled wheel axle, which resulted in exceptionally long valve connecting rods of. 48. The coupled wheels were diameter, and the other principal dimensions were : cylinders diameter by stroke; coupled wheelbase. 49. The arcs of the leading and trailing radial axle boxes were struck from a centre midway between the coupled wheels . 50. It had coupled wheels with a 1, 640 mm diameter and was therefore regarded as a multi-purpose locomotive.
