P E N N S Y L V A N I A   R A I L R O A D   S Y S T E M  13
Cylinders 13½" x 22"
Drivers, diam. 60"
Weight on drivers 22,875 lb.
Weight, total engine  38,675 lb.

     There were four locomotives of this class. They had hook motion valve gear, and independent half-stroke cut-off. 
Wyoming - 1850
American Type Passenger Locomotive "Wyoming," built by The Baldwin Locomotive Works, 1850 
 
Cumberland - 1852
Six-coupled Freight Locomotive "Cumberland," built by The Baldwin Locomotive Works, 1852 
Cylinders 18"x22"
Drivers, diam. 44"
Weight on drivers 48,200 lb.
Weight, total engine  59,600 lb.

     There were six locomotives of this class. All were subsequently rebuilt by the Railroad Company with four-wheeled leading trucks. 
 
Cylinders 18" X 22"
Drivers, diam. 44"
Weight on drivers 46,100 lb.
Weight, total engine  64,500 lb.

     There were six locomotives of this class, one of which was probably sold to the Philadelphia and Columbia R. R. and repurchased by the Pennsylvania in 1857. 
Berks - 1852
Six-coupled Freight Locomotive "Berks," built by The Baldwin Locomotive Works, 1852 
 
Latrobe - 1852
Six-coupled Freight Locomotive, built by Smith and Perkins, Alexandria, Vs., in 1852 
Cylinders 17" x 22" 
Drivers, diam. 44"
Weight on drivers 41,800 lb.
Weight, total engine  54,200 lb.

     Equipped with drop-hook valve gear, having separate eccentrics for front gear, back gear, and cut-off. One valve for each cylinder. Partially rebuilt in 1862 and worn out in 1874. 
 
Cylinders 16" X 22" 
Drivers, diam. 78"
Weight on drivers 37,900 lb.
Weight, total engine  61,300 lb.

     Equipped with hook motion valve gear and independent variable cut-off. Subsequently rebuilt with 66-inch drivers. There were three Wilmarth locomotives of this general design on the Pennsylvania.
Antelope - 1852
American Type Passenger Locomotive, built by Seth Wilmarth, Boston, 1852 
The above illustrations are from Drawings by C.H. Caruthers 

 
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