Hocking Valley 4-4-0 "American" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class P3 (Locobase 7847)

Data from Hocking Valley 9-1924 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

There's little information about the history of these locomotives in the diagram, but it does have one typo (or "printo" since the annotation is handwritten) that results in amusing overstatement. The Loughridge Belpaire firebox's area on these little Eight-wheelers was in fact a bit bigger than the average, but to call coal's landing place "great area" perhaps preens a bit. See Locobase 7848 for the P-4s, which had not so greats but more firebox area.


Class P4/A-14 (Locobase 7848)

Data from Hocking Valley 9-1924 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.Works numbers were 29501-29504 in February 1904.

Four years after the P-3s arrived from Brooks (Locobase 7847), that builder rounded out the decade with four more. These had slightly less "great" area in their narrower Loughridge Belpaire fireboxes but more heating surface, and six fewer boiler tubes. Otherwise they were quite similar.


Class P5 (Locobase 7849)

Data from Hocking Valley 9-1924 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Locobase enjoys the little mysteries unearthed while compiling a database of the world's steam locomotives. For example, the editor often notes that a successor class often connotes merely removing a few tubes from the boiler. Such happened on the HV from 1900's P-3 ((Locobase 7847) to 1904's P-4 (Locobase 7848). But why take out 54 more in the next year's delivery, as happened in the current entry? The Loughridge Belpaire firebox remains and the power dimensions are identical. Was the original boiler too big?

At this point, one should note, the grate area is no longer "great" - the "printo" has been corrected.

Let's press on; see Locobase 7850.


Class P6 (Locobase 7850)

Data from Hocking Valley 9-1924 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

See Locobases 7847-7849 for the first three HV classes of Eight-wheelers in this series. All had the Loughridge Belpaire firebox, the same power dimensions and wheelbases. Compared to the others, this final pair of 4-4-0s had a boiler whose size put it in the middle. Unlike the others, however, the P6 threw over the Stephenson link motion and slide valve in favor of Walschaert radial gear and 10 1/4" piston valves.

Specifications by Steve Llanso of Sweat House Media
ClassP3P4/A-14P5P6
Locobase ID7847 7848 7849 7850
RailroadHocking Valley (C&O)Hocking Valley (C&O)Hocking Valley (C&O)Hocking Valley (C&O)
CountryUSAUSAUSAUSA
Whyte4-4-04-4-04-4-04-4-0
Number in Class6432
Road Numbers71-7677-8081-8384-85
GaugeStdStdStdStd
Number Built6432
BuilderBrooksAlco-BrooksAlco-BrooksAlco-Brooks
Year1900190419051907
Valve GearStephensonStephensonStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.75 / 2.67 8.75 / 2.67 8.75 / 2.67 8.75 / 2.67
Engine Wheelbase (ft / m)24 / 7.3224 / 7.3224 / 7.3224 / 7.32
Ratio of driving wheelbase to overall engine wheebase 0.36 0.36 0.36 0.36
Overall Wheelbase (engine & tender) (ft / m)47.25 / 14.4047.25 / 14.4047.25 / 14.4044.50 / 13.56
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)90,000 / 40,82390,000 / 40,82389,200 / 40,46091,400 / 41,458
Engine Weight (lbs / kg)135,550 / 61,485135,700 / 61,553135,200 / 61,326141,400 / 64,138
Tender Loaded Weight (lbs / kg)103,200 / 46,811104,100 / 47,219103,200 / 46,811109,400 / 49,623
Total Engine and Tender Weight (lbs / kg)238,750 / 108,296239,800 / 108,772238,400 / 108,137250,800 / 113,761
Tender Water Capacity (gals / ML)5000 / 18.945000 / 18.945000 / 18.945000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.1010 / 9.1010 / 9.1010 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)75 / 37.5075 / 37.5074 / 3776 / 38
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)66 / 167666 / 167666 / 167666 / 1676
Boiler Pressure (psi / kPa)180 / 12.40180 / 12.40180 / 12.40180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x66018" x 26" / 457x66018" x 26" / 457x66018" x 26" / 457x660
Tractive Effort (lbs / kg)19,528 / 8857.7619,528 / 8857.7619,528 / 8857.7619,528 / 8857.76
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.61 4.61 4.57 4.68
Heating Ability
Firebox Area (sq ft / m2)161.90 / 15.05166.54 / 15.48167.71 / 15.59167.71 / 15.59
Grate Area (sq ft / m2)30.81 / 2.8628.82 / 2.6828.82 / 2.6828.82 / 2.68
Evaporative Heating Surface (sq ft / m2)1973 / 183.361941 / 180.391619 / 150.461793 / 166.64
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1973 / 183.361941 / 180.391619 / 150.461793 / 166.64
Evaporative Heating Surface/Cylinder Volume257.65253.47211.42234.15
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5546518851885188
Same as above plus superheater percentage5546518851885188
Same as above but substitute firebox area for grate area29,14229,97730,18830,188
Power L17195717263546804
Power MT352.49351.37314.08328.23

Reference