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
Locobase ID6024 6025 6026
RailroadMaryland & Pennsylvania (Ma & Pa)Maryland & Pennsylvania (Ma & Pa)Maryland & Pennsylvania (Ma & Pa)
Number in Class421
Road Numbers23-2641-4243
Number Built421
BuilderBurnham, Williams & CoBaldwinBaldwin
Valve GearStephensonWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase14'14.25'14.25'
Engine Wheelbase21.67'23.33'23.33'
Ratio of driving wheelbase to overall engine wheebase 0.65 0.61 0.61
Overall Wheelbase (engine & tender)46.63'55.21'55.62'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers108550 lbs170330 lbs182180 lbs
Engine Weight123600 lbs193850 lbs207050 lbs
Tender Light Weight89253 lbs122680 lbs123800 lbs
Total Engine and Tender Weight212853 lbs316530 lbs330850 lbs
Tender Water Capacity4000 gals6000 gals6000 gals
Tender Fuel Capacity (oil/coal)8 tons10 tons10 tons
Minimum weight of rail (calculated)45 lb/yard71 lb/yard76 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter50"51"51"
Boiler Pressure175 psi190 psi190 psi
Cylinders (dia x stroke)19" x 24"22" x 28"22" x 28"
Tractive Effort25775 lbs42915 lbs42915 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21 3.97 4.25
Heating Ability
Firebox Area130.30 sq. ft207.30 sq. ft227.50 sq. ft
Grate Area30.70 sq. ft49.50 sq. ft49.70 sq. ft
Evaporative Heating Surface1555 sq. ft2425 sq. ft2331 sq. ft
Superheating Surface511 sq. ft587 sq. ft
Combined Heating Surface1555 sq. ft2936 sq. ft2918 sq. ft
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 percentage53731100411332
Same as above but substitute firebox area for grate area228034608351870
Power L140861056711473
Power MT331.94547.08555.35

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