Table of Dimensions of Simple and Compound Road Locomotives              |               |               |               |
Nominal horse-power |               6 |               8 |               10 |
Indicated horse-power |               30 |               40 |               50 |
Diameter of cylinder, single |               8 in. |               9 in. |               10 in. |
Stroke of cylinder, single |               12 in. |               12 in. |               12 in. |
Diameter of high-pressure cylinder, compound |               5¾ in. |               6½ in. |               7 in. |
Diameter of low-pressure cylinder, compound |               9 in. |               10 in. |               11 in. |
Stroke of both cylinders, compound |               12 in. |               12 in. |               12 in. |
Working steam pressure, single |               125 lb |               125 lb |               125 lb |
Working steam pressure, compound |               145 lb |               145 lb |               145 lb |
Revolutions of engine governing, per minute |               180 rpm |               180 rpm |               180 rpm |
Revolutions of engine on the road, per minute |               240 rpm |               240 rpm |               240 rpm |
Total heating surface, single |               120 sq. ft. |               160 sq. ft |               200 sq. ft. |
Grate area, single |               4½ sq. ft. |               6 sq. ft. |               7½ sq. ft. |
Total heating surface, compound |               108 sq. ft. |               144 sq. ft. |               180 sq. ft. |
Grate area, compound |               4¼ sq. ft. |               5½ sq. ft. |               7 sq. ft. |
Diameter of driving wheels |               6 ft. |               6½ ft. |               7 ft. |
Width of driving wheels |               14 in. |               16 in. |               18 in. |
Slow gear ratio |               25 to 1 |               27 to 1 |               30 to 1 |
Fast gear ratio |               17 to 1 |               18 to 1 |               20 to 1 |
Diameter of leading wheels |               4 ft. |               4½ ft. |               4¾ ft. |
Width of leading wheels |               8 in. |               9 in. |               10 in. |
Diameter of main axle |               4½ in. |               5 in. |               5½ in. |
Diameter of crankshaft |               3¼ in. |               3½ in. |               3¾ in. |
Diameter of crankpin |               3½ in. |               3¾ in. |               4 in. |
Pitch of first motion spur gearing |               1¾ in. |               2 in. |               2¼ in. |
Pitch of second motion spur gearing |               2 in. |               2¼ in. |               2½ in. |
Pitch of third motion spur gearing |               2¼ in. |               2½ in. |               2¾ in. |
Diameter of compensating gear bevel wheels |               2¼ ft. |               2½ ft. |               2¾ ft. |
Pitch of compensating gear bevel wheels |               2¼ in. |               2½ in. |               2¾ in. |
Slow traveling speed in miles per hour |               4 to 5 |               4 to 5 |               4 to 5 |
Fast traveling speed in miles per hour |               2 |               2 |               2 |
Diameter of fly wheel |               4 ft. |               4½ ft. |               5 ft. |
Width of fly wheel |               6 in. |               6 in. |               6¼ in. |
Weight of engine in working trim |               10 tons |               12 tons |               15 tons |
Approximate load hauled on fairly level roads |               18 tons |               25 tons |               32 tons |
Total width of engine |               6 ft. |               6¼ ft. |               6¾ ft. |
Total length of engine |               16 ft. |               18 ft. |               18½ ft. |