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Virginian class XA
United States | 1916
only one produced
Baldwin works photo
Baldwin works photo

Two years after Baldwin had delivered the class P-1 triplex locomotives to the Erie, another one was delivered to the Virginian. This locomotive got the number 700 and was designated class XA. In general it had a similar layout, but a two-axle trailing truck under the tender.

So like the P-1, it had six cylinders of the same size, although these were smaller than those of the predecessor to reduce the steam consumption. The middle ones served as high-pressure cylinders. The exhaust steam of the right one fed both front low-pressure cylinders, while the left one fed the two rear ones. Also here the exhaust steam of the rear cylinders was used for a feed water heater in the tender, what in turn reduced the draft in the boiler and thus hindered the steam production.

In the result, its performances were similar to those of the P-1. The maximum speed at which the locomotive could utilize its full power was 5 mph. After only three years of operation with continuous efforts by Baldwin employees to remedy its problems, it was returned to its builder. There its parts were used to create a 2-8-8-0 Mallet of the class AF and a Mikado of the class MD.

General
Built1916
ManufacturerBaldwin
Axle config2-8-8-8-4 (Triplex)
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase67 ft 58 in
Rigid wheelbase15 ft 3 in
Total wheelbase91 ft 3 in
Service weight842,310 lbs
Adhesive weight725,475 lbs
Axle load62,000 lbs
Water capacity13,000 us gal
Fuel capacity24,000 lbs (coal)
Boiler
Grate area107.6 sq ft
Firebox area431 sq ft
Tube heating area7,689 sq ft
Evaporative heating area8,120 sq ft
Superheater area2,059 sq ft
Total heating area10,179 sq ft
Power Plant
Driver diameter56 in
Boiler pressure220 psi
Expansion typecompound
Cylinderssix, HP: 34 x 32 in
and LP: 34 x 32 in
Power
Power sourcesteam
Estimated power2,100 hp (1,566 kW)
Optimal speed5 mph
Starting effort185,290 lbf
with start valve222,348 lbf
Calculated Values
steam locomotive
freight
triplex
Mallet
last changed: 07/2024
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