It had four 4 ft diameter driving wheels and a maximum speed of about 15 mph. A pair of cross-heads above the cylinders transmitted the power through a pair of connecting rods, making use of a loose eccentric valve gear. Locomotion No. 1 is believed to have been the first locomotive to use coupling rods to connect its driving wheels together, an approach that considerably decreased the chance of slipping.

Author H. C. Casserley