Diagram comparing the Pioneer (shaded drawing) with the Columbia, a standard 8-wheel engine of 1851. (Drawing by J. H. White.)

Columbia

Hudson River Railroad
Lowell Machine Shop, 1852
Wt. 271/2 tons (engine only)
Cyl. 161/2 x 22 inches
Wheel diam. 84 inches

Pioneer

Cumberland Valley Railroad
Seth Wilmarth, 1851
121/2 tons
81/2 x 14 inches
54 inches