Fairbanks-Morse H12-44 Phases
Phase I – May, 1950, to January, 1951
Only 18 phase I units were built:
- ATSF 503-506
- Chicago & North Western 1071-1072
- Milwaukee Road 1826-1827
- New York Central 9111-9120
The first H12-44’s were simply H10-44’s with fuel rack settings modified to yield another 200 horsepower. They were indistinguishable externally from the final phase of the earlier model.
Raymond Lowery’s design elements continued:
- The nose is swept back at a steep angle, topped by decorative crest
- A curved panel extends from the cab to the front of the battery box
- The roof extends well over the walkway behind the cab
The phase I units are noted for having three sets of very large louvers above the hood doors near the cab. There is a single opening in the hood doors, a screened panel directly behind radiator.
Fairbanks Morse discontinued using it’s round builder plate during this phase, switching to their new rectangular plate on the New York Central engines.
Phase Ia – January, 1951, to June, 1952
There were 85 phase Ia units built:
- ATSF 507-516
- Baltimore & Ohio 310-319
- Kentucky & Indiana Terminal 60-64
- Milwaukee Road 1828-1847 and 2300-2309
- Minnesota Western 10
- New York Central 9121-9137
- US Steel Fairless Works GE9-GE16
- Weyerhouser 1
Four screened openings are added in the hood doors. There are now two openings behind the radiator, a pair of openings in the door in front of the battery box step, and a short opening above the battery box in the first door in front of the cab.
Phase Ib – June to September, 1952
Only 15 Phase Ib units were built:
- ATSF 517-530
- Soo Line 315
The three banks of large louvers are replaced by a Phase II-style raised box with two sets of louvers.
Soo Line 315, built before the Santa Fe units, was slightly different in that it had two screened openings above the battery box, rather than one. This may have been at the customer’s request, an experiment, or something added by the railroad after construction.
Here is a photo of Soo Line 315 at rrpicturearchives.net.
Phase II – September, 1952, to February, 1953
There were 46 Phase II units built:
- Chicago & North Western 1110-1113
- Indianapolis Union Railway 19-21
- Pennsylvania Railroad 8711-8723
- Southern Pacific 1486-1491
- US Army 1858-1862
Phase II was a complete redesign of the carbody. Most of the Raymond Lowery styling elements are gone. The cab roof no longer extends over the rear walkway, and the sloped front of the hood with it’s decorative crest is gone. All that remains is the curved panel between the cab and the front of the battery box. Look closely, however, and notice that the hood vents have not changed from the Phase Ib units.
Phase III – February, 1953, to December, 1955
There were 67 phase III units:
- ATSF 531-549
- Baltimore & Ohio 196-197
- Central of Georgia 315-318
- Chicago & North Western 1114-1116
- Fairbanks Morse 76
- Kentucky & Indiana Terminal 65-66
- Milwaukee Road 2310-2325
- Nickel Plate 134-138
- Pennsylvania Railroad 8708-8710
- Sandersville 100
- Soo Line 316-319
- Southern Pacific 1529-1538
- Tennesee Valley Authority 22
- Wabash 384-386
The final element of Raymond Lowery styling is removed: the curved panel between the cab and the front of the battery box. Four sets of louvers are added to the battery boxes to eliminate the risk of explosion. The square screened opening above the door line near the cab has been replaced with two sets of heavy louvers.
Phase IIIa – January to May, 1956
There were 20 Phase IIIa units:
- ATSF 550-568
- Columbia & Cowlitz D2
- Southern Pacific 1568-1576
- Yankeetown Dock D2
The screened openings in the hood doors were all changed to sets of heavy louvers.
Phase IV – October, 1956 to February, 1957
There were 18 Phase IV units:
- Southern Pacific 1577-1596
The carbody has been shortened by three feet. The battery box is reduced to half the size it was previously. he side skirt below the walkway is deeper. A small screen opening present in the second door in front of the battery box. The radiator fan and traction motor blowers are now belt driven instead of using electric motors.
Phase IVa – March, 1957, to March, 1961
There were 30 Phase IVa units:
- Ayshire Collieries 1
- ATSF 559-564
- Baltimore & Ohio 9722-9726
- Chihuahua al Pacifico 70
- Nickel Plate Road 139-155
The slot in the door in front of the battery box step has been replaced with a large bank of louvers.