loco-info.com - US Railroad Administration Heavy Santa Fé

Pennsylvania Rairoad N2sa No. 8110 in 1933 in Columbus, Ohio

collection Taylor Rush

The USRA standard model for heavy, slow coal trains was the Heavy Santa Fé. ALCO-Brooks delivered 135 and Baldwin 40 more. By far the largest number were the 130 members of the Pennsylvania Railroad's class N2s. The locomotives were generally considered a successful design that fulfilled their tasks satisfactorily. As early as 1923, the PRR rebuilt them with new boilers with Belpaire fireboxes and renamed them class N2sa. A fundamental problem with the Heavy Santa Fé was the very long frame, which was not cast in one piece. This warped over time, leading to increased maintenance costs.

General
Built	1918-1919
Manufacturer	ALCO, Baldwin
Axle config	2-10-2 (Santa Fé)
Gauge	4 ft 8 1/2 in (Standard gauge)

Dimensions and Weights
Length loco	55 ft 3 7/8 in
Wheelbase	42 ft 2 in
Rigid wheelbase	22 ft 4 in
Total wheelbase	82 ft 10 1/2 in
Service weight	380,000 lbs
Adhesive weight	293,000 lbs
Total weight	586,100 lbs
Axle load	58,600 lbs
Water capacity	12,000 us gal
Fuel capacity	32,000 lbs (coal)

Boiler
Grate area	83.2 sq ft
Firebox area	429 sq ft
Tube heating area	4,727 sq ft
Evaporative heating area	5,156 sq ft
Superheater area	1,230 sq ft
Total heating area	6,386 sq ft

Power Plant
Driver diameter	63 in
Boiler pressure	190 psi
Expansion type	simple
Cylinders	two, 30 x 32 in

Power
Power source	steam
Estimated power	3,600 hp (2,685 kW)
Top speed	35 mph
Starting effort	73,829 lbf

Calculated Values
Factor of adhesion	1 : 3.97
Optimal speed	31 mph
Power-to-weight ratio	0.0095 hp/lb
Heating Area Equivalent	9,761 sq ft
Cylinder volume/HAE	1 : 817.50
Adhesive weight/Total	1 : 1.30
Tractive force/Heating area	1 : 2599.03
Grate area/Heating area	1 : 71.59
Firebox/Tube area	1 : 13.89
Total/Superheater	1 : 4.19

steam locomotive

freight

last changed: 11/2023

Schematic drawing with dimensions

1922 Locomotive Cyclopedia of American Practice

Navigation