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.
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.
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|
|Railroad||Maryland & Pennsylvania (Ma & Pa)||Maryland & Pennsylvania (Ma & Pa)||Maryland & Pennsylvania (Ma & Pa)|
|Number in Class||4||2||1|
|Builder||Burnham, Williams & Co||Baldwin||Baldwin|
|Locomotive Length and Weight|
|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 Drivers||108550 lbs||170330 lbs||182180 lbs|
|Engine Weight||123600 lbs||193850 lbs||207050 lbs|
|Tender Light Weight||89253 lbs||122680 lbs||123800 lbs|
|Total Engine and Tender Weight||212853 lbs||316530 lbs||330850 lbs|
|Tender Water Capacity||4000 gals||6000 gals||6000 gals|
|Tender Fuel Capacity (oil/coal)||8 tons||10 tons||10 tons|
|Minimum weight of rail (calculated)||45 lb/yard||71 lb/yard||76 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||175 psi||190 psi||190 psi|
|Cylinders (dia x stroke)||19" x 24"||22" x 28"||22" x 28"|
|Tractive Effort||25775 lbs||42915 lbs||42915 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.21||3.97||4.25|
|Firebox Area||130.30 sq. ft||207.30 sq. ft||227.50 sq. ft|
|Grate Area||30.70 sq. ft||49.50 sq. ft||49.70 sq. ft|
|Evaporative Heating Surface||1555 sq. ft||2425 sq. ft||2331 sq. ft|
|Superheating Surface||511 sq. ft||587 sq. ft|
|Combined Heating Surface||1555 sq. ft||2936 sq. ft||2918 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||197.44||196.85||189.22|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||5373||9405||9443|
|Same as above plus superheater percentage||5373||11004||11332|
|Same as above but substitute firebox area for grate area||22803||46083||51870|