Bangor & Portland / Boston & Providence 4-4-0 "American" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 8 (Locobase 9948)

Data from "Bangor & Portland Locomotive", Locomotive Engineering, Vol XI, No5 (May 1898), p. 217. Works number 2386. For B & P information, see http://pcapp1.tripod.com/bangor_and_portland_rail_way.htm, last accessed 8 Feb 2009.

"While there is nothing remarkable about this engine," said our correspondent, "it is thoroughly modern - a heavy engine for that road - indicating they are alive to the advantage of heavy motive power."

Alive, perhaps, but not flush - this was the only locomotive in the class for this Pennsylvania railway (Locobase's surprise at this railway not being located in Maine can be imagined.) Chartered in 1880, the B&P began construction and soon absorbed the Bangor & Bath. Its principal destination from Portland was Nazareth, 17 miles away, but on a circuitous route. Soon a 4.6-mile branch from Nazareth Junction across the Delaware to Martins Creek Station in New Jersey to connect with the Pennsylvania.

So configured, the B & P was bought by the Delaware, Lackawanna & Western on 1 July 1903 and was renamed the Bangor & Portland Division.


Class Attelborough (Locobase 9540)

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.

The last of the engines on George Griggs' 1856 list was this smaller Eight-wheeler that may have been built as a replacement for an earlier locomotive.


Class Blackstone (Locobase 9528)

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.

Griggs gradually enlarged his Eight-wheeler by adding more tubes and lengthening each one. Blackstone entered service in April 1847.


Class Bristol (Locobase 9526)

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.

Griggs' third Roxbury-built machine was delivered a month after Suffolk in June 1846 and combined the larger boiler of the second engine with the shallower firebox.


Class Canton (Locobase 9534)

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 was the next model in Griggs' basic Eight-wheeler design and appeared May 1849. Not much had changed in the 6 months since he delivered the Rhode Island (Locobase 9532), but it was about to - see Locobase 9535.


Class Iron Horse (Locobase 9531)

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.

Griggs clearly was designing different engines for specific service. This next Roxbury engine, delivered in September 1848, reverted to a smaller grate and cylinder volume, but lengthened its boiler by a foot. Rhode Island (Locobase 9532) was identical except for cylinder volume and driver diameter.


Class Mansfield (Locobase 9539)

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.

Another of the very few foreigners on Griggs' 1856 list, this Massachusetts engine was quite a bit bigger than any of the homebuilts (and most Taunton locomotives of the time) and showed very many of the characteristics typical of an American Eight-wheeler of the time.


Class Massachusetts (Locobase 9527)

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.

Griggs' third Roxbury-built machine was delivered a month after Suffolk in June 1846 and combined the larger boiler of the second engine with the shallower firebox.


Class Narraganset (Locobase 9530)

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.

Virtually identical to the Taghconic that had appeared a month earlier, the Narraganset was the most powerful Griggs engine so far. Its larger cylinder volume raised the yet-to-be-calculated tractive effort.


Class Neponset (Locobase 9535)

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 was the only Griggs engine that would have the 2"-diameter boiler tube that would be a standard size later on in the Century. Its delivery in June 1849 provided a passenger engine with a slightly larger boiler.


Class Norfolk (Locobase 9524)

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.

George Griggs' first home-built locomotives set the pattern for the next several B & P engines. Norfolk, Suffolk (Locobase 9525), and Bristol (Locobase 9526) were virtually identical but are shown to illustrate the tentative nature of Griggs' first efforts. Norfolk was completed first in May 1845 and had the smallest drivers and the fewest tubes.


Class Providence (Locobase 9533)

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.

One of the few "foreign" engines to appear on Griggs' 1856 motive power was this slightly smaller locomotive from another Massachusetts builder delivered in February 1849. Its firebox was a bit bigger in relation to its tube surface area, but the other dimensions were not significantly different.


Class Rhode Island (Locobase 9532)

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.

Rhode Island shared virtually all of the major dimensions with Iron Horse, which also entered service in Septermber 1848. Its stroke was 2" longer and it stood on taller drivers, suggesting a more resolutely passenger-service orientation.


Class Suffolk (Locobase 9525)

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.

Griggs' second B & P machine added a few tubes to the boiler and deepened the firebox, but was otherwise similar to the Norfolk although it was delivered a year later in May 1846.


Class Taghconic (Locobase 9529)

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.

The Eight-wheeler design was beginning to take its most recognized form, but it was still small.. Grate area still came in below 10 sq ft and the total heating surface was less than 700 sq ft. Output at the B & P's Roxbury shop was about to jump with this first of the 1848 locomotives.


Class W R Lee (Locobase 9537)

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.

More than three years younger than the next-oldest mainline B & P locomotive, this locomotive achieved a considerable size increase when it came on the road in September 1853. Cylinder volume had increased as had grate area and tube surface area.


Class Washington (Locobase 9538)

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.

September 1854 was only 2 years before Griggs published the table from which the Locobase entries have been taken. By this time, he had adopted the standard Eight-wheeler layout, although the dimensions were still a bit small. New York, which followed in December 1854 may have been an identical design except for the smaller drivers (60") and tubes that measured 2 ft longer.

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Specifications by Steve Llanso of Sweat House Media
Class8AttelboroughBlackstoneBristolCanton
Locobase ID9948 9540 9528 9526 9534
RailroadBangor & PortlandBoston & ProvidenceBoston & ProvidenceBoston & ProvidenceBoston & Providence
CountryUSAUSAUSAUSAUSA
Whyte4-4-04-4-04-4-04-4-04-4-0
Number in Class11111
Road Numbers8
GaugeStdStdStdStdStd
Number Built11111
BuilderCookeP & B RoxburyB&P RoxburyB&P RoxburyB&P Roxbury
Year18981855184718461849
Valve GearStephensonlinkLinkHookLink
Locomotive Length and Weight
Driver Wheelbase11.50'
Engine Wheelbase21.92'
Ratio of driving wheelbase to overall engine wheebase 0.52
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers84000 lbs20880 lbs21050 lbs
Engine Weight110000 lbs44700 lbs35805 lbs
Tender Light Weight78000 lbs20800 lbs
Total Engine and Tender Weight188000 lbs65500 lbs
Tender Water Capacity3700 gals1269 gals1354 gals1471 gals
Tender Fuel Capacity (oil/coal)6.5 tons tons1.5 tons1.5 tons1.5 tons
Minimum weight of rail (calculated)70 lb/yard17 lb/yard018 lb/yard0
Geometry Relating to Tractive Effort
Driver Diameter54"54"60"60"60"
Boiler Pressure180 psi75 psi75 psi75 psi75 psi
Cylinders (dia x stroke)19" x 26"15" x 20"14.75" x 20"14.63" x 18"14.75" x 20"
Tractive Effort26594 lbs5313 lbs4623 lbs4093 lbs4623 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.16 3.93 5.14
Heating Ability
Firebox Area143 sq. ft66 sq. ft49.20 sq. ft44.80 sq. ft56.60 sq. ft
Grate Area31.50 sq. ft10.75 sq. ft 9.37 sq. ft 8.75 sq. ft 9.50 sq. ft
Evaporative Heating Surface1747 sq. ft623 sq. ft651 sq. ft571 sq. ft717 sq. ft
Superheating Surface
Combined Heating Surface1747 sq. ft623 sq. ft651 sq. ft571 sq. ft717 sq. ft
Evaporative Heating Surface/Cylinder Volume204.76152.30164.59163.04181.27
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5670806703656713
Same as above plus superheater percentage5670806703656713
Same as above but substitute firebox area for grate area257404950369033604245
Power L146751573170117031896
Power MT245.40332.17356.72

Specifications by Steve Llanso of Sweat House Media
ClassIron HorseMansfieldMassachusettsNarragansetNeponset
Locobase ID9531 9539 9527 9530 9535
RailroadBoston & ProvidenceBoston & ProvidenceBoston & ProvidenceBoston & ProvidenceBoston & Providence
CountryUSAUSAUSAUSAUSA
Whyte4-4-04-4-04-4-04-4-04-4-0
Number in Class11111
Road Numbers
GaugeStdStdStdStdStd
Number Built11111
BuilderB&P RoxburyTauntonB&P RoxburyB&P RoxburyB&P Roxbury
Year18481855184618481849
Valve GearFixed, cut-offVariable cut-offLinkFixed, cut-offLink
Locomotive Length and Weight
Driver Wheelbase
Engine Wheelbase
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers24000 lbs34300 lbs24000 lbs28000 lbs
Engine Weight40100 lbs52900 lbs40100 lbs43050 lbs
Tender Light Weight37000 lbs
Total Engine and Tender Weight89900 lbs
Tender Water Capacity1526 gals1354 gals1526 gals1471 gals
Tender Fuel Capacity (oil/coal)1.5 tons tons1.5 tons1.5 tons1.5 tons
Minimum weight of rail (calculated)20 lb/yard29 lb/yard020 lb/yard23 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter60"60"60"54"66"
Boiler Pressure75 psi100 psi75 psi75 psi100 psi
Cylinders (dia x stroke)14.75" x 18"16" x 20"14.75" x 18"16" x 20"14.75" x 20"
Tractive Effort4161 lbs7253 lbs4161 lbs6044 lbs5604 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.77 4.73 3.97 5.00
Heating Ability
Firebox Area50.80 sq. ft76.30 sq. ft52 sq. ft49.50 sq. ft56.60 sq. ft
Grate Area 9.20 sq. ft13.10 sq. ft 8.71 sq. ft 9.20 sq. ft 9.50 sq. ft
Evaporative Heating Surface726 sq. ft1023 sq. ft637 sq. ft668 sq. ft765 sq. ft
Superheating Surface
Combined Heating Surface726 sq. ft1023 sq. ft637 sq. ft668 sq. ft765 sq. ft
Evaporative Heating Surface/Cylinder Volume203.94219.80178.94143.53193.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6901310653690950
Same as above plus superheater percentage6901310653690950
Same as above but substitute firebox area for grate area38107630390037135660
Power L120653018189013282914
Power MT379.38387.96243.98458.88

Specifications by Steve Llanso of Sweat House Media
ClassNorfolkProvidenceRhode IslandSuffolkTaghconic
Locobase ID9524 9533 9532 9525 9529
RailroadBoston & ProvidenceBoston & ProvidenceBoston & ProvidenceBoston & ProvidenceBoston & Providence
CountryUSAUSAUSAUSAUSA
Whyte4-4-04-4-04-4-04-4-04-4-0
Number in Class11111
Road Numbers
GaugeStdStdStdStdStd
Number Built11111
BuilderB&P RoxburyTauntonB&P RoxburyB&P RoxburyB&P Roxbury
Year18451849184818461848
Valve GearHookLinkLinkHooklink
Locomotive Length and Weight
Driver Wheelbase
Engine Wheelbase
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers20555 lbs28000 lbs28307 lbs21705 lbs26580 lbs
Engine Weight34460 lbs44400 lbs44307 lbs35705 lbs41500 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity1358 gals1531 gals1286 gals1355 gals1526 gals
Tender Fuel Capacity (oil/coal)1.5 tons1.5 tons1.5 tons1.5 tons1.5 tons
Minimum weight of rail (calculated)17 lb/yard23 lb/yard24 lb/yard18 lb/yard22 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter55"60"66"60"66"
Boiler Pressure75 psi100 psi75 psi75 psi75 psi
Cylinders (dia x stroke)14.5" x 18"15" x 18"14.75" x 20"14.63" x 18"14.75" x 18"
Tractive Effort4387 lbs5738 lbs4203 lbs4093 lbs3783 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.69 4.88 6.73 5.30 7.03
Heating Ability
Firebox Area44.80 sq. ft54.40 sq. ft50.80 sq. ft50.50 sq. ft56.50 sq. ft
Grate Area 8.75 sq. ft10 sq. ft 9.20 sq. ft 8.50 sq. ft 9.55 sq. ft
Evaporative Heating Surface550 sq. ft645 sq. ft726 sq. ft577 sq. ft675 sq. ft
Superheating Surface
Combined Heating Surface550 sq. ft645 sq. ft726 sq. ft577 sq. ft675 sq. ft
Evaporative Heating Surface/Cylinder Volume159.87175.20183.55164.75189.61
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6561000690638716
Same as above plus superheater percentage6561000690638716
Same as above but substitute firebox area for grate area33605440381037884238
Power L115472491204417762219
Power MT331.85392.26318.38360.78368.10

Specifications by Steve Llanso of Sweat House Media
ClassW R LeeWashington
Locobase ID9537 9538
RailroadBoston & ProvidenceBoston & Providence
CountryUSAUSA
Whyte4-4-04-4-0
Number in Class11
Road Numbers
GaugeStdStd
Number Built11
BuilderB&P RoxburyB&P Roxbury
Year18531854
Valve GearVariable cut-offlink
Locomotive Length and Weight
Driver Wheelbase
Engine Wheelbase
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers30666 lbs
Engine Weight48930 lbs48666 lbs
Tender Light Weight29943 lbs
Total Engine and Tender Weight78609 lbs
Tender Water Capacity1473 gals1475 gals
Tender Fuel Capacity (oil/coal)1.5 tons1.7 tons
Minimum weight of rail (calculated)026 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter66"66"
Boiler Pressure75 psi75 psi
Cylinders (dia x stroke)15.75" x 18"15" x 20"
Tractive Effort4313 lbs4347 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 7.05
Heating Ability
Firebox Area71.90 sq. ft70.60 sq. ft
Grate Area10.70 sq. ft11.10 sq. ft
Evaporative Heating Surface976 sq. ft827 sq. ft
Superheating Surface
Combined Heating Surface976 sq. ft827 sq. ft
Evaporative Heating Surface/Cylinder Volume240.46202.17
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation803833
Same as above plus superheater percentage803833
Same as above but substitute firebox area for grate area53935295
Power L127142380
Power MT342.20


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