2-8-8-4 "Yellowstone" Locomotives in the USA

Only 72 Yellowstones were built (in five different classes). Each class of Yellowstone was a different design (except for the two classes owned by the DM&IR). The design was usually dictated by the specific needs of the railroad that received them. The first to have a Yellowstone built was the Northern Pacific who named the wheel arrangment after Yellowstone Park (a region serviced by the Northern Pacific).

RailroadClassQuantityYear BuiltBuilder
NPZ-5121928ALCO(1), Baldwin(11)
SPAC-9121939Lima
DM&IRM-3/4181941Baldwin
B&OEM-1301944Baldwin

A Comparison of Yellowstone Designs

This table compares the various Yellowstone designs along with that of the UP Big Boy and Western Pacific 2-8-8-2. All Yellowstone classes employed simple steam expansion and thus none can be called "mallets".

TypeNP
Z-5
SP
AC-9
DM&IR
M-3
DM&IR
M-4
B&O
EM-1
UP
4884-1
WP
M-137/151
Series50003800-3811220-237228-2377600-76194000-4019251-260
Cyl:dia x stroke26x3224x3226x3226x3224x3223.75x3226x32
Driver diameter6363.56363646863
Boiler pressure250250240240235300250
Grate area182139.3125125117.5150145
Evaporative heating surface7673691867806758/678052985889
Superheater heating surface321928312770277021182466
Weight on drivers554,000531,200560,257564,974485,000540,000552,700
Total engine weight715,000689,900695,040699,700628,700762,000665,100
Tender weight401,000400,700436,635438,335382,000427,500408,250
Tractive force engine145,930124,300140,000140,000115,000135,375137,000
Tractive force booster13,400NoneNoneNoneNoneNone13,900

Railroads that used 2-8-8-4 "Yellowstone" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media)

Surviving Examples of 2-8-8-4 "Yellowstone" Locomotives in the USA

No.ClassF.M. WhyteGaugeRailroad LineLocationStatusBuilder InfoNotes
2-8-8-414½"Whiskey Riverunknown, Cleveland, OHstoredFrom Marshall, WI; being regauged to 16
227M-32-8-8-44'-8½"DM&IR Lake Superior Railroad Museum, Duluth, MNdisplayBaldwin #62533, 1941
225M-32-8-8-44'-8½"DM&IR US 2, Proctor, MNdisplayBaldwin #62531, 1941
229M-42-8-8-44'-8½"DM&IR D&IR Depot, Two Harbors, MNdisplayBaldwin #64708, 1943

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