USRA ENGINE SPECS

SWITCHERS

Wheel arrangement 0-6-0 0-8-0
Steam pressure, psi 190 175
Cylinder bore x stroke 21 x 28 25 x 28
Driver dia, in. 51 51
Tractive effort, lbs. 39,100 51,000
Valve gear Baker Baker
Boiler dia, in 66 80
Weight of engine, lbs 163,000 214,000
Number built 255 175

PACIFIC TYPES

Wheel arrangement 4-6-2 lt 4-6-2 hvy
Steam pressure, psi 200 200
Cylinder bore x stroke 25 x28 27 x 28
Driver dia, in. 73 79
Tractive effort, lbs. 40,700 43,900
Valve gear Baker Baker
Boiler dia, in 76-86 78-90
Weight of engine, lbs 277,000 306,000
Number built 81 20

MOUNTAIN TYPES

Wheel arrangement 4-8-2 lt 4-8-2 hvy
Steam pressure, psi 200 200
Cylinder bore x stroke 27 x 30 28 x 30
Driver dia, in. 69 69
Tractive effort, lbs. 53,900 58,200
Valve gear Baker Baker
Boiler dia, in 78-90 86-96
Weight of engine, lbs 327,000 352,000
Number built 47 15

MIKADO TYPES

Wheel arrangement 2-8-2 lt 2-8-2 hvy
Steam pressure, psi 200 190
Cylinder bore x stroke 26 x 30 27 x 32
Driver dia, in. 63 63
Tractive effort, lbs. 54,700 60,000
Valve gear Walscherts Walscherts
Boiler dia, in 78-90 86-96
Weight of engine, lbs 292,000 320,000
Number built 625 233

SANTA FE TYPES

Wheel arrangement 2-10-2 lt 2-10-2 hvy
Steam pressure, psi 200 190
Cylinder bore x stroke 27 x 32 30 x 32
Driver dia, in. 57 63
Tractive effort, lbs. 69,600 73,800
Valve gear Southern Southern
Boiler dia, in 86-96 88-100
Weight of engine, lbs 352,000 380,000
Number built 94 175

ARTICULATEDS

Wheel arrangement 2-6-6-2 2-8-8-2
Steam pressure, psi 225 240
Cylinder bore x stroke 23 x 32 & 35 x 32 23 x 32 & 39 x 32
Driver dia, in. 57 57
Tractive effort, lbs. 80,000 101,300
Valve gear Baker Baker
Boiler dia, in 90-96 97-105
Weight of engine, lbs 448,000 531,000
Number built 30 80

All burned coal.
All were superheated.
Total of all built 1830.

S.A. McCall