Alco PA & PB Somebody's Large Digital Image Here
Quantity Built: 250 PAs and 47 PBs Production Run: June 1946 to December 1953
Info Supplied by: John Komanesky Photograph by: John Mech
Revised: 8 Oct. 2011 New: 5 Jan. 2005
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PA-1 Production
Drawing and Data by: Jean-Denis Bachand
Original owner Road Numbers Qty. Bldr Numbers Bldr Dates
Alco (American Freedom Train) 1776 1 74696 8/47
Alco (Demo) 9077, 9078 2 75791, 75792 12/49
Atchison Topeka & Santa Fe 51L, 51B 2 75000, 75002 9/46
52L, 52B 2 75003, 75005 12/46
53L, 53B-55L, 55B 6 75315-75320 4-6/47
56L, 56B 2 74688, 75322 7/47
57L, 57B 2 75321, 74689 7/47
58L, 58B 2 74690, 74691 8/47
59L, 59B-62L, 62B 8 76535-76542 10-12/48
70L-73L 4 76087-76090 2-3/48
Denver & Rio Grande Western 6001, 6003 2 74684, 74685 1, 2/47
6011, 6013 2 74686, 74687 4/47
Erie 850-854 5 76908-76912 4/49
855-857 3 77103-77105 9/49
858, 859 2 77501, 77502 9/49
860, 861 2 75793, 75794 11/49
Gulf Mobile & Ohio 290, 291 2 74682, 74683 11, 12/46
Lehigh Valley 601. 602 2 75458, 75459 3/48
603-606 4 75460-75463 4/48
607-612 6 75775-75780 4/48
613, 614 2 75781, 75782 5/48
Missouri-Kansas-Texas 151A, 151C 2 76917, 76918 4/49
152A, 152C 2 76919, 76920 5/49
Missouri Pacific 8001-8008 8 77503-77510 10/49
New York Central 4200, 4201 2 75328, 75329 1/47
4202 1 76086 1/48
4203 1 76307 12/48
4204-4207 4 76913-76916 4/49
New York Chicago & St. Louis(Nickel Plate) 180-186 7 75330-75336 12/47
187-190 4 75454-75457 3/48
New York New Haven & Hartford 760-769 10 76076-76085 8-9/48
770-784 15 76312-76326 1-3/49
785, 786 2 76906, 76907 3/49
Pennsylvania 5750A-5754A 5 74697-74701 10-11/47
5755A-5759A 5 75323-75327 11-12/47
St. Louis-Southwestern 300, 301 2 77511, 77512 11/49
Southern Pacific 6005A, 6005C 2 75783, 75784 5/48
6006A, 6006C 2 76072, 76073 6/48
6007A, 6007C 2 76074, 76075 7/48
6008A,C-6010A,C 6 77097-77102 8/49
Texas & New Orleans (SP) 200A,B-202A,B 6 77085-77090 6/49
203A, 203B 2 77091, 77092 7/49
204A,B-205A,B 4 77093-77096 8/49
Union Pacific 604-607 4 76308-76311 1/49
994A-997A 4 74692-74695 8/47
Wabash 1020, 1020A 2 77081, 77082 5/49
1021, 1021A 2 77083, 77084 5/49
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PA-2 Production
Drawing and Data by: Jean-Denis Bachand
Alco ("More Power for America") 8375 1 75790 3/50
Erie 862, 863 2 78732. 78733 4/51
Missouri-Kansas-Texas 154A, 154C 2 78349, 78350 11/50
155A,C-157A,C 6 78726-78731 3-5/51
Missouri Pacific 8009-8012 4 78135-78138 4/50
8013-8018 6 78734-78739 5-6/51
8019-8022 5 79042-79045 5-6/52
8023-8026 4 78208-78211 6/52
8027-8030 4 78957-78960 7-8/52
8031-8036 6 80045-80050 8-9/52
New York Central 4208-4211 4 78204-78207 6/50
4213, 4214 2 79040, 79041 5/52
Southern Rwy 6900-6903 4 80846-80849 10-11/53
6904, 6905 2 81081, 81082 12/53
Southern Pacific 6019, 6020 2 77999, 78000 8/50
6021, 6022 2 78001, 78002 9/50
6023 1 78740 4/52
6024-6027 4 79036-79039 4-5/52
6028-6033 6 80434-80439 5-6/53
6034 1 80443 9/53
6035-6045 11 80835-80845 9-10/53

EXPORT

BRAZIL

Paulista Railway 900-902 3 80440-80442 10/53
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PB-1 Production
Drawing and Data by: Jean-Denis Bachand
Atchison Topeka & Santa Fe 51A, 52A 2 75001, 75004 10, 12/46
53A-56A 4 75337-75340 4-6/47
57A, 58A 2 74704, 74705 7, 8/47
59A-62A 4 76543-76546 10-12/48
70A-73A 4 76091-76094 2-3/48
Denver & Rio Grande Western 6002, 6012 2 74702, 74703 2, 4/47
New York Central 4300, 4301 2 75605, 75606 1/48
4302, 4303 2 75610, 75611 12/48
Pennsylvania 5750B, 5752B 2 75343, 75344 10/47
5754B, 5756B 2 75345, 75346 11/47
5758B 1 75347 12/47
Southern Pacific 6005B-6007B 3 75607-75609 5-6/48
6008B-6010B 3 75786-75788 8/49
Union Pacific 604B-606B 3 75612-75614 1/49
607B 1 75785 1/49
998B, 999B 2 75341, 75342 9/47
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PB-2 Production
Drawing and Data by: Jean-Denis Bachand
Alco ("More Power for America") 8375B 1 75789 3/50
Southern Pacific 5918, 5919 2 78219, 78220 8-9/50
5920, 5921 2 78212, 78213 4/52
5922-5924 3 80607-80609 5-6/53
Roster information: Extra 2200 South
The first PA-1 and PB-1 were released by ALCO for testing on the Lehigh Valley on June 26, 1946. Photos of the first PA-1 and PB-1 testing on the Lehigh Valley in Black Demo paint are in Richard Steinbrenner's ALCO A Centennial Remembrance pp255-258. Steinbrenner documents the ceremony for the "ALCO 6000" at Schenectady on September 18, 1946 and then more ceremonies at New York City September 22-24, 1946. The three new Santa Fe units of  #51L, A, B were turned over to the New York Central for movement to Chicago on September 25, 1946. According to Early Diesel Daze by John McCall the Santa Fe did not receive these units until October 1946.  McCall on p167 notes that #51 left Chicago for Los Angeles with #7 the Fast Mail and Express on October 4, 1946.  (Footnote provided by Ed Cooper.)
PA roster corrections and additions by: Martin Baumann and R. Craig
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PA-4 Remanufacturing
Drawing and Data by: Jean-Denis Bachand
Delaware & Hudson 16 1 76535 10/48
17 1 76537 11/48
18 1 76541 12/48
19 1 75318 5/47
Heritage
  • #16 - Santa Fe 59L
  • #17 - Santa Fe 60L
  • #18 - Santa Fe 62L
  • #19 - Santa Fe 66L, nee 54B


* * * Technical Data * * *


Alco PA / PB

(DL304,B,C,D / DL305,B,C,D)

Technical Data

 

Drawings and Data by: Jean-Denis Bachand
Engine 244 V-16 (4-cycle) Alco PA-1: 2000 hp vvvv PA-2: 2250 hp Bore & Stroke: 9.0" x 10.5" RPM (Max. / Min.): 1000 / 400 Wgt: PA: 303,500 lbs. vvv PB: 300,700 lbs.
Powertrain Main Gen.: GT566C1 vvvv PA-2: GT586 Traction Motors: vvvGE-746A2 (four) Tractive Force (starting): 50,865 lbs @ 25% Tractive Force (continuous): 30,500 lbs @ 20 mph T/M Blowers: Stuart (Mech. - two)
Trucks A1A-A1A (3 axles) Wheel Dia: 42" Speed: 100 mph / Gear Ratio: 62:21 Turning Radius (min): ? degrees Wheelbase: 15'-4"
Operation M/U Capability Dyn. Braking Auxillary Generator: GE DC56 Air Comp.: Westinghouse 3CD Air Brake: West. 6L
Capacities

Fuel: 1000 gal.

Lub Oil: 192 gal.

Cooling Water: 250 gal.

Sand: 22 cubic feet

Steam Gen.: Vapor - 3000 psi

Dimensions PA Length: 65'-8"vvvv PB Length: 63'-8" Bolster: 34'-2"" Pilot-to-Pilot (distance) PA: 63'-3" vvvvvvvvvvvvvvvvvvvv PB: 60'-6" Engine Hood Heighth *: 15'-2" Cab Heighth*: 14'-0"
Dimensions Cab Width: 10'-6.5" -- Length over handrails: -- Distance between Truck Centers: 49'-8""
* Distance is from top of railhead.

Reference Sources:

  • A Centennial Remembrance: by Richard T. Steinbrenner
  • Early Diesel Electric & Electric Locomotive by Rail Heritage
  • Train Shed Cyclopedia #64
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PA-4 Rebuild

(by Morrison-Knudsen)

Technical Data

Drawing and Data by: Jean-Denis Bachand
Engine 251F V-12 (4-cycle) 2400 hp Bore & Stroke: 9.0" x 10.5" RPM (Max. / Min.): 1025 / 400 Wgt: PA: 317,900 lbs.
Powertrain Main Gen.: GT566E5 Traction Motors: vvvGE-752E6 (four) Tractive Force (starting): 79,475 lbs @ 25% Tractive Force (continuous): 33,600 lbs @ 19 mph T/M Blowers: Stuart (Mech. - two)
Trucks A1A-A1A (3 axles) Wheel Dia: 42" Speed: 100 mph / Gear Ratio: 62:21 Turning Radius (min): ? degrees Wheelbase: 15'-6"
Operation M/U Capability Dyn. Braking Auxillary Generator: GE GY27A3 Air Comp.: Westinghouse 3CDB Air Brake: West. 6L
Capacities

Fuel: 1260 gal.

Lub Oil: 250 gal.

Cooling Water: 280 gal.

Sand: 22 cubic feet

Steam Gen.: Vapor - 4625

Dimensions PA Length: 65'-8"vvvv PB Length: 63'-8" Bolster: 34'-2"" Pilot-to-Pilot (distance) PA: 63'-3" vvvvvvvvvvvvvvvvvvvv PB: 60'-6" Engine Hood Heighth *: 14'-8" Cab Heighth*: 14'-11"
Dimensions Cab Width: 10'-6.5" -- Length over handrails: -- Distance between Truck Centers: 49'-8""
* Distance is from top of railhead.

Reference Sources:

  • PA-4 Locomotive: by N.E. Anderson & C.G. MacDermot
Notes: Locomotives were remanufactured by Morrison-Knudsen at the Boise, Idaho shops.

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