Inside Connected Eight Wheeled Locomotive Built for the B. & O. Railroad in 1854.
Cylinders, 15 by 22 inches, drivers 60 inches, boiler 44 inches diameter, weight 56,000 pounds
source: Scientific American July 25, 1896
Camel-Back Locomotive Built for the B. & O. Railroad in 1853
Cylinders, 19 by 22 inches; drivers, 50 inches; weight, 71,000 pounds; steam pressure, 120 pounds.