Maryland & Pennsylvania 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 23 (Locobase 6024)

Data from George W. Fitch, Jr.'s compilation (Maryland and Pennsylvania Railroad Preservation and Historical Society photocopy reprint, 2004).

Evidence that the Ma & Pa was serious about its freight hauling came with this class of Consolidations supplied over a decade (1902 - works #20003-20004, 1905 - 25426, and 1912 - 38697). The first two were fitted with Southern valve gear in 1915.

The two for which Fitch provides retirement information -- 24 & 25 -- were out of service in May 1936 and November 1939. 23 and 26 left in March 1947.


Class 41 (Locobase 6025)

Locomotive data from George W. Fitch, Jr.'s compilation (Maryland and Pennsylvania Railroad Preservation and Historical Society photocopy reprint, 2004) and DeGolyer, Volume 50, pp. 245+. Works numbers were 41504-41505 in June 1914.

The first superheated locomotives for the Ma & Pa, this pair represented a substantial step up in power. Arch tubes contributed 28.3 sq ft (2.63 sq m) of the firebox heating surface and the piston valves had relatively large 14" (356 mm) diameters. They traveled on 70 lb/yard (35 kg/metre) rails.

42 was retired first in January 1952. 41 held on for another 5 years before being scrapped in May 1957.

Locobase note: Seven years later, Railway Age profiled a batch of eleven Mexican Railway locomotives (Locobase 3236) with exactly the same specifications. The data come from very different yet equally (and solidly) reliable sources, so this may an example of selling from stock.


Class 43 (Locobase 6026)

Locomotive data from George W. Fitch, Jr.'s compilation (Maryland and Pennsylvania Railroad Preservation and Historical Society photocopy reprint, 2004). See also DeGolyer, Volume 76, pp. 360+. Works number was 58491 in June 1925.

The last new locomotive for the Ma & Pa, this Consolidation had the same tractive power as the 1914 pair (Locobase 6025), but was heavier and had a higher percentage of superheat area. Arch tubes in the firebox of the 1914 engines were replaced in 43's design by two thermic syphons that supported the firebox's brick arch, which represented 50.5 sq ft of firebox heating surface. 43 also had 14" (356 mm) diameter pistons. The design can be described as typical of late-period American 2-8-0s, although the syphons were relatively rare as was the Elesco feed water heater.

Data from M&PA 1956ca Locomotive Diagrams, supplied in May 2005 by Allen Stanley from his extensive Raildata collection, shows that the 43 went out of service in December 1956.

Specifications by Steve Llanso of Sweat House Media
Class234143
Locobase ID6024 6025 6026
RailroadMaryland & Pennsylvania (Ma & Pa)Maryland & Pennsylvania (Ma & Pa)Maryland & Pennsylvania (Ma & Pa)
CountryUSAUSAUSA
Whyte2-8-02-8-02-8-0
Number in Class421
Road Numbers23-2641-4243
GaugeStdStdStd
Number Built421
BuilderBurnham, Williams & CoBaldwinBaldwin
Year190219141925
Valve GearStephensonWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1414.2514.25
Engine Wheelbase (ft)21.6723.3323.33
Ratio of driving wheelbase to overall engine wheebase 0.65 0.61 0.61
Overall Wheelbase (engine & tender) (ft)46.6355.2155.62
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)108,550170,330182,180
Engine Weight (lbs)123,600193,850207,050
Tender Loaded Weight (lbs)89,253122,680123,800
Total Engine and Tender Weight (lbs)212,853316,530330,850
Tender Water Capacity (gals)400060006000
Tender Fuel Capacity (oil/coal) (gals/tons)81010
Minimum weight of rail (calculated) (lb/yd)457176
Geometry Relating to Tractive Effort
Driver Diameter (in)505151
Boiler Pressure (psi)175190190
High Pressure Cylinders (dia x stroke) (in)19" x 24"22" x 28"22" x 28"
Tractive Effort (lbs)25,77542,91542,915
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21 3.97 4.25
Heating Ability
Firebox Area (sq ft)130.30207.30227.50
Grate Area (sq ft)30.7049.5049.70
Evaporative Heating Surface (sq ft)155524252331
Superheating Surface (sq ft)511587
Combined Heating Surface (sq ft)155529362918
Evaporative Heating Surface/Cylinder Volume197.44196.85189.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation537394059443
Same as above plus superheater percentage537311,00411,332
Same as above but substitute firebox area for grate area22,80346,08351,870
Power L1408610,56711,473
Power MT331.94547.08555.35