Boston & Providence 4-2-0 "Jervis" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class Boston (Locobase 9522)

Data from table entitled "Motive Power Boston & Providence Railroad Company," Railway and Locomotive Engineering, October 1899, page 443, which was prepared by George S Griggs, then (November 1856) Superintendent of Motive Power at the B & P's Roxbury, Mass Machine Shop. NB: Boiler pressure is an estimate.

This Bury design was one of only 3 locomotives on the 1856 roster to operate a single set of drivers. The other two (built by Roxbury) were smaller; see Locobase 9523.


Class Dedham (Locobase 13546)

Data from table entitled "Table of Dimensions of the Locomotives" in New England Association of Railway Superintendents, Report of the Trials of Locomotive Engines Made Upon 1st and 2nd October, 1851 (Boston: B J Yerrinton, Printers, 1852), p. 16.

NB: Boiler pressure is an estimate.

It's not clear if Roxbury was a tank engine (the entry is shown in Locobase 9523). But the Dedham, also designed by George S Griggs and delivered in May 1851, is so described. These were small engines with V-hook motion and lap valves. The number of tubes is surprisingly large, but each tube had a relatively small diameter. Smaller than the other engines in the trial, the Dedham made its own 9-mile run trailing 2 passenger cars carrying 81 passengers for a total load of 18 tons.

The engine was scrapped in 1888.


Class Roxbury (Locobase 9523)

Data from table entitled "Motive Power Boston & Providence Railroad Company," Railway and Locomotive Engineering, October 1899, page 443, which was prepared by George S Griggs, then (November 1856) Superintendent of Motive Power at the B & P's Roxbury, Mass Machine Shop. See also Charles E Fisher, A Little Story of the Boston & Providence Railroad (self-published, 1917).

These were small engines with V-hook motion and lap valves. The number of tubes is surprisingly large, but each tube had a relatively small diameter. Roxbury was delivered in April 1851. It was scrapped in 1888.

Dedham, which is described as tank engine, was delivered in May and is described in Locobase 13546.

NB: Boiler pressure is an estimate.

Specifications by Steve Llanso of Sweat House Media
ClassBostonDedhamRoxbury
Locobase ID9522 13,546 9523
RailroadBoston & ProvidenceBoston & ProvidenceBoston & Providence
CountryUSAUSAUSA
Whyte4-2-04-2-0T4-2-0
Number in Class122
Road Numbers
GaugeStdStdStd
Number Built122
BuilderEdward BuryB&P RoxburyB&P Roxbury
Year184518511851
Valve GearLinkV-hookV-hook
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)25,350 / 11,499
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)25,350
Tender Water Capacity (gals / ML)780 / 2.95300 / 1.14300 / 1.14
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 152454 / 137254 / 1372
Boiler Pressure (psi / kPa)75 / 5.2075 / 5.2075 / 5.20
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x4579" x 16" / 229x4069" x 16" / 229x406
Tractive Effort (lbs / kg)2754 / 1249.191530 / 694.001530 / 694.00
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)40.20 / 3.7322 / 2.0429.30 / 2.72
Grate Area (sq ft / m2) 9.20 / 0.85 4.50 / 0.42 4.60 / 0.43
Evaporative Heating Surface (sq ft / m2)383 / 35.58383 / 35.58387 / 35.95
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)383 / 35.58383 / 35.58387 / 35.95
Evaporative Heating Surface/Cylinder Volume162.55325.10328.50
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation690338345
Same as above plus superheater percentage690338345
Same as above but substitute firebox area for grate area301516502198
Power L1185928253057
Power MT