| 12 | M O T I V E P O W E R D E V E L O P M E N T |
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drivers in
starting, and thus increasing the adhesion. These locomotives proved speedy
with light trains, but their usefulness was very limited, and two of them
were subsequently, rebuilt as 4-4-0 type locomotives.
A group of 16 Baldwin locomotives of the 4-4-0 type, with driving wheels 54 inches in diameter, built during the years 1849-1852 and represented by the "Juniata" (below), were typical of a class of power extensively used at that time for general passenger and freight service. |
| at
half-stroke. These two locomotives were shortly afterward sold to the Philadelphia
and Reading Railroad, but a third one of similar design, the "Westmoreland,"
built early in 1850, remained in service on the Pennsylvania until 1866.
The "Perry" is illustrated on page 11.
Records indicate that the first Baldwin engine built for the Pennsylvania to be actually placed in service on the road was the "Mifflin," a fast passenger locomotive completed in July, 1849. Two similar locomotives, the "Blair" and "Indiana," followed later in the year. As shown on page 11, these locomotives had a single pair of driving wheels back of the firebox, one pair of carrying wheels in front of the firebox, and a four-wheeled truck under the front end. The design was generally similar to that of the locomotive "Governor Paine," built by Mr. Baldwin for the Central Vermont Railroad in 1848-49. An unusual feature was a "traction increaser" for the purpose of transferring weight from the carrying wheels to the |
Contemporary
with them were two other groups of 4-4-0 type locomotives with 60-inch
wheels; one group, of three locomotives, having 15 x 20-inch cylinders,
and the other group of four, having 13½ x 22-inch cylinders, and
represented by the "Wyoming," illustrated on page 13. All these locomotives
had hook valve motion and also independent valves designed to cut off at
half-stroke.
During the period August, 1852, to January, 1853, Mr. Baldwin built for the Pennsylvania a group of 12 six-coupled freight locomotives with 18 x 22-inch cylinders and driving wheels 44 inches in diameter. Six of these locomotives had four-wheeled leading trucks, while the remaining six had a single pair of leading wheels placed immediately under the cylinders. Both designs are illustrated on page 13. The former type weighed approximately 64,500 pounds with 46,000 pounds on drivers, while the latter are stated to have weighed about 60,000 pounds with 48,000 pounds on drivers. The records indicate; however, that some of these |
|
| Cylinders 15" x
20"
Drivers, diam. 54" Weight on drivers 25,825 lb. Weight, total engine 45,275 lb. Equipped with hook motion valve gear and half-stroke cut-off. There were 16 locomotives of this class. |
PHOTO COMING SOON!
American Type Passenger Locomotive "Juniata," built by The Baldwin Locomotive Works, 1849 |
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