Montana Union / Seattle & International / Northern Pacific 2-8-0 "Consolidation" Type Locomotives

Class F (Locobase 827)

Later converted to G-class 0-8-0s.

Class F-1 (Locobase 829)

Built 1888-1891.

Three (50-52) were converted to Vauclain compounds for three years (1899-1902), then converted back to simple-expansion engines. As compounds, they had 15 x 28 HP cylinders, 25 x 28 LP cylinders.

Class F-2 (Locobase 830)

Data confirmed by locomotive diagrams from 1900 hosted on http://www.nprr.org/Steam%20Diagrams/Forms/AllItems.aspx (7 Feb 2004).

Class F-3 (Locobase 832)

Data confirmed by locomotive diagrams from 1900 hosted on http://www.nprr.org/Steam%20Diagrams/Forms/AllItems.aspx (7 Feb 2004).

NY Loco builder information from JF Webber's compilation as supplied by Allen Stanley in March 2004. The first of MU's class of Consolidations was works #455 (February 1889). Six months later the rest of the class rolled out of the Rome shops as works #498-503.

Once the Northern Pacific took over, these 2-8-0s were renumbered frequently, many 3 times over. One - works #501 - was operated by the Seattle & International as their #10, then served with the Northern Pacific, and finally on the Frisco (St Louis-San Francisco).

Class F-4 (Locobase 828)

Data confirmed by locomotive diagrams from 1900 hosted on http://www.nprr.org/Steam%20Diagrams/Forms/AllItems.aspx (7 Feb 2004). The diagram notes that #94 had 19 1/2" cylinders.

Class F-5 (Locobase 837)

Boiler pressure later increased to 165 psi.

Data confirmed by locomotive diagrams from 1900 hosted on http://www.nprr.org/Steam%20Diagrams/Forms/AllItems.aspx (7 Feb 2004) and supplemented by NP to 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Class F-7 (Locobase 831)

Data confirmed by locomotive diagrams from 1900 hosted on http://www.nprr.org/Steam%20Diagrams/Forms/AllItems.aspx (7 Feb 2004). This is an unusual design with longer tubes.

Class F-8 (Locobase 833)

Data from a 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection. This is an ex-Pennsylvania Railroad locomotive class.

Class Y (Locobase 835)

Data from a 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Delivered as compounds in 1898, rebuilt and superheated in 1917 to the dimensions shown.

Class Y-1 (Locobase 6559)

Data from a 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Delivered as tandem compounds in 1900; simpled and superheated in 1917; see Locobase 833.

Class Y-1 - superheated (Locobase 836)

Data from a 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Delivered as compounds in 1900, rebuilt 1917 to the dimensions shown. Very similar to the Y-class rebuilds with slightly longer tubes but the same superheater.

Class Y-2 (Locobase 838)

Originally delivered as 4-cylinder balanced compounds in 1901-1902. As such they were profiled in Railroad Gazette 30 August 1901. The long stroke meant that the LP volume could never be large enough to make full use of the HP exhaust. These were soon converted to 2-cylinder simple engines with much lower boiler pressure.

Class Y-3 (Locobase 839)

4-cylinder tandem compounds built for low-speed drag freight. As such they differed from the Y-2s delivered at the same time, according to RG 30 August 1901. Additional data from AERJ June 1903. Firebox heating surface included 28 sq ft of arch tubes.

These were soon converted to 2-cylinder simple locomotives.

Class Y-4 (Locobase 840)

Data from a 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection. Somewhat smaller than the earlier Y classes, but fitted with much taller drivers.

Class Y-4 (Locobase 10272)

4-cylinder tandem compounds built for low-speed drag freight. As such they differed from the Y-2s delivered at the same time, according to RG 30 August 1901. Additional data from AERJ June 1903. Firebox heating surface included 28 sq ft of arch tubes.

These were soon converted to 2-cylinder simple locomotives.

Class Y-5 (Locobase 841)

Data from a 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Class Y-5 (Locobase 10273)

4-cylinder tandem compounds built for low-speed drag freight. As such they differed from the Y-2s delivered at the same time, according to RG 30 August 1901. Additional data from AERJ June 1903. Firebox heating surface included 28 sq ft of arch tubes.

These were soon converted to 2-cylinder simple locomotives.

Specifications
ClassFF-1F-2F-3F-4F-5F-7F-8YY-1Y-1 - superheatedY-2Y-3Y-4Y-4Y-5Y-5
Locobase ID82782983083282883783183383565598368388398401027284110273
RailroadNorthern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Montana Union (NP)Montana Union (NP)Seattle & International (NP)Seattle & International (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)Northern Pacific (NP)
Whyte2-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-02-8-0
Road Numbers95-10350-8182-83154 / 84-9192-9445-4648-49(4-6)30-4317-2917-291250-12791200-12131280-12931280-12931214-12231214-1223
GaugeStdStdStdStdStdStdStdStdStdStdStdStdStdStdStdStdStd
BuilderBurnham, Parry, Williams & CoBurnham, Parry, Williams & CoBurnham, Parry, Williams & CoNew York (Rome)GrantSchenectadyRhode IslandJuniataAlco-SchenectadyAlco-SchenectadyAlco-SchenectadyAlco-SchenectadyAlco-SchenectadyAlco-SchenectadyAlco-SchenectadyAlco-SchenectadyAlco-Schenectady
Year18831888188818891887190018881891189819001917190119011903190319031903
Valve GearStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase14'14.25'15.58'14.75'14'16.08'13.67'14.67'15'15'17'15'17'17'15'15'
Engine Wheelbase22.17'22.33'23.17'22.75'21.33'23.37'21.17'23.25'23.58'23.58'26.17'23.67'26.17'26.17'23.67'23.67'
Ratio of driving wheelbase to overall engine wheebase 0.63 0.64 0.67 0.65 0.66 0.69 0.65 0.63 0.64 0.64 0.65 0.63 0.65 0.65 0.63 0.63
Overall Wheelbase (engine & tender)49.17'49.75'48.79'47.25'49.12'46.42'53.87'52.37'52.37'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers96000 lbs135000 lbs122000 lbs113000 lbs100000 lbs120250 lbs109000 lbs85300 lbs173300 lbs170000 lbs172500 lbs175000 lbs185500 lbs172000 lbs172000 lbs178500 lbs178500 lbs
Engine Weight108000 lbs150000 lbs136000 lbs125000 lbs113500 lbs135000 lbs124000 lbs97600 lbs191000 lbs195000 lbs192300 lbs198000 lbs209500 lbs194000 lbs194000 lbs198000 lbs198000 lbs
Tender Light Weight77500 lbs77600 lbs90000 lbs90000 lbs90200 lbs71500 lbs30270 lbs112000 lbs112000 lbs94000 lbs114950 lbs114950 lbs114950 lbs114950 lbs114950 lbs114950 lbs
Total Engine and Tender Weight185500 lbs227600 lbs226000 lbs215000 lbs0225200 lbs195500 lbs127870 lbs303000 lbs307000 lbs286300 lbs312950 lbs324450 lbs308950 lbs308950 lbs312950 lbs312950 lbs
Tender Water Capacity3500 gals3500 gals4244 gals2900 gals3250 gals4350 gals3500 gals3090 gals5500 gals4350 gals5500 gals5500 gals5500 gals5500 gals5500 gals5500 gals
Tender Fuel Capacity (oil/coal)7 tons7 tons9 tons6 tons6 tons11 tons8 tons10 tons10 tons tons9 tons10 tons10 tons10 tons10 tons10 tons10 tons
Minimum weight per yard of rail on which locomotive could run40 lb rail56.25 lb rail50.83 lb rail47 lb rail41.67 lb rail50 lb rail45.42 lb rail35.54 lb rail72.21 lb rail70.83 lb rail71.88 lb rail72.92 lb rail77.29 lb rail71.67 lb rail72 lb rail74.38 lb rail74 lb rail
Geometry Relating to Tractive Effort
Driver Diameter49"50"51"51"51"51"55"51"55"55"55"63"55"63"63"55"55"
Boiler Pressure130 psi150 psi150 psi150 psi140 psi150 psi150 psi140 psi200 psi200 psi200 psi225 psi200 psi200 psi200 psi200 psi200 psi
Cylinders (dia x stroke)20" x 24"22" x 28"21" x 26"20" x 24"20" x 24"20" x 24"20" x 24"20" x 24"20" x 34"15" x 34"20" x 34"15" x 34" (4)15" x 34"22" x 30"22" x 30"22" x 30"22" x 30"
Tractive Effort21649 lbs34558 lbs28665 lbs24000 lbs22400 lbs24000 lbs22255 lbs22400 lbs42036 lbs36745 lbs42036 lbs54134 lbs34773 lbs39181 lbs39181 lbs44880 lbs44880 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.43 3.91 4.26 4.71 4.46 5.01 4.90 3.81 4.12 4.63 4.10 3.23 5.33 4.39 4.39 3.98 3.98
Heating Ability
Firebox Area155.64 sq. ft201 sq. ft201 sq. ft
Grate Area30.70 sq. ft35.29 sq. ft32.70 sq. ft26.60 sq. ft28 sq. ft31 sq. ft26 sq. ft24.90 sq. ft35 sq. ft35 sq. ft35 sq. ft52.30 sq. ft52.30 sq. ft52.30 sq. ft52.30 sq. ft52.30 sq. ft52.30 sq. ft
Evaporative Heating Surface232119861868200019841284216130752219299736463418341836523652
Superheating Surface468468
Combined Heating Surface02321198618682000198401284262930752687299736463418341836523652
Evaporative Heating Surface/Cylinder Volume188.41190.54214.06229.18227.35147.14174.80442.19179.49215.49524.30258.96258.96276.69276.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation39915293.5049053990392046503900348670007000700011767.501046010460104601046010460
Same as above plus superheater percentage39915293.504905399039204650390034868246.1070008219.2011767.501046010460104601046010460
Same as above but substitute firebox area for grate area00000000000350194020000040200
Power L1000000000003680.794414.210006469
Power MT00000000000185.48209.85000319.59

Reference

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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