The Pennsy Modeler

In order to portray Pennsylvania Railroad and interchange partners as accurately as possible, this blog contains articles which are essentially notes to myself, but are shared should the community desire the same information.


Baldwin VO-660, Class BS6

The Baldwin VO-660 was a diesel-electric locomotive switcher built by Baldwin Locomotive Works between April, 1939 and May, 1946. The 197,520–203,980 lb units were powered by a six-cylinder diesel engine rated at 660 horsepower, and rode on two-axle AAR Type-A switcher trucks in a B-B wheel arrangement. 142 examples of this model were built for American railroads, along with the United States Navy. Baldwin replaced the VO-660 with the model DS-4-4-660 in 1946.


Baldwin RT-624, Class BS24 / BS24m

The Baldwin RT-624 was a twin-engined diesel-electric locomotive, built by Baldwin Locomotive Works between 1951 and 1954.

The RT-624, an improved version of the Baldwin DT-6-6-2000, was a center-cab transfer locomotive. Twenty-four locomotives were built using 6-cylinder turbocharged 606A prime movers during 1951–1954.

Road Numbers Qty Class Delivery HO Scale Models
8952, 8953 2 BS24 7/51  
8954-8965 12 BS24m 8-11/51  
8724-8731 8 BS24m 9-12/52  
8113 1 BS24m 2/54  
        Custom Brass



scheme1 p

by Bob Reid

From Pennsy Journal, V1 #1.

One of the more unusual models of diesel road power on the Pennsy was the passenger sharks. In their final days on the Long Branch, they attracted more railfans from all over the country in a effort to capture on film their operation. Only the Baldwin Centipedes surpassed the passenger sharks in my interest of Pennsy diesel power.


FM H-16-44, Class FS16m

The FM H-16-44 was a road-switcher produced by Fairbanks-Morse from April 1950 – February 1963. The locomotive shared an identical platform and carbody with the predecessor Model FM H-15-44 (but not the FM H-20-44 end cab road switcher which used a different carbody and frame and a larger prime mover), and were equipped with the same eight-cylinder opposed piston engine that had been uprated to 1,600 horsepower. The H-16-44 was configured in a B-B wheel arrangement, mounted atop a pair of two-axle AAR Type-B road trucks with all axles powered. In late 1950, the AAR trucks were almost exclusively replaced with the same units found on the company's "C-liner" locomotives.

PRR 677216 H25 MLC1939 600x160 grande

The Pennsy's fleet of H25 class hoppers were built between July 1919 and July 1923. In addition to the 3,000 built for the PRR, the Pennsy 2,287 of the same cars from private operators, including Emmons Coal Company, Bethlehem Steel Company, Pickens-Mather and Co., and Youngstown Sheet & Tube Co., bringing the total to 5,287. Other than 500 purchased from Emmons, all others were built by Cambria Steel in Johnstown, Pa.

The H25 differed subtly in appearance from the H21A, and was done so because of lessons learned from the H21, H22 and H24 class hopper cars. The cars were initially delivered with a "drop-door" arrangement, but by August 1928 conversions began to the more modern "saw tooth" arrangement. There were many more differences, particularly on the ends, which are discussed in John Teichmoeller's book, Pennsylvania Railroad Steel Open Top Hopper Cars.


FM H-10-44, Class FS10

The FM H-10-44 was a yard switcher produced by Fairbanks-Morse from August, 1944–March, 1950. The units featured a 1,000-horsepower, six-cylinder opposed piston engine prime mover, and were configured in a B-B wheel arrangement mounted atop a pair of two-axle AAR Type-A switcher trucks, with all axles powered. Many H-10-44s received modifications that increased their horsepower rating to 1,200 hp.

These are the paint schemes applied to the GG1 over the course of the Pennsy. The green was actually darker, but is shown light here in order to contrast with black.

Early Prototype Scheme
1934 PRR: Dark Green, block pinstriping, small number keystone

1934: 4899/4800 only. (unit changed numbers in this scheme)

Developed by the PRR, this scheme predates the Loewy design. A similar design was used on the R1 experimental.

gg1 bbg


Lima-Hamilton LT-2500, Class LS25 / LS25m

The Lima-Hamilton 2500 horsepower Transfer locomotive (sometimes referred to by its Specification Number, A-3177 or the railfan designation LT-2500) was a diesel-electric transfer-unit locomotive, built by the Lima Locomotive Works between 1950 and 1951. The LT-2500 was the final locomotive model produced by Lima-Hamilton before the company merged with the Baldwin Locomotive Works in 1951.

All twenty-two units were purchased by the Pennsylvania Railroad.

Road Numbers Qty Class Delivery HO Scale Models
5671-5683 13 LS25 5-7/50  
8943-8951 9 LS25m 5-9/51  
        Custom Brass


As of 1884 (interpreted from Form 76), the Pennsylvania Railroad -- which did not include "Lines West of Pittsburgh" -- was organized into Grand Divisions, Divisions, and Railroads. Railroads represented in bold are included in the listings but are believed to be independent railroads (many are confirmed so).


GE 44 Ton, Class GS4 / GS4m

The GE 44-ton switcher is a 4-axle diesel-electric locomotive built by General Electric between 1940 and 1956. It was designed for industrial and light switching duties, often replacing steam locomotives that had previously been assigned these chores. This locomotive's specific 44-short ton weight was directly related to one of the efficiencies the new diesel locomotives offered compared to their steam counterparts: reduced labor intensity. In the 1940s, the steam to diesel transition was in its infancy in North America, and railroad unions were trying to protect the locomotive fireman jobs that were redundant with diesel units. One measure taken to this end was the 1937 so-called "90,000 Pound Rule", a stipulation that locomotives weighing 90,000 pounds  – 45 short tons – or more required a fireman in addition to an engineer on common carrier railroads. Industrial and military railroads had no such stipulation. The 44-ton locomotive was born to skirt this requirement. Other manufacturers also built 44-ton switchers of center-cab configuration. 276 examples of this locomotive were built for U. S. railroads and industrial concerns, four were exported to Australia in 1944, 10 were exported to Canada, 10 were exported to Cuba, one was exported to the Dominican Republic, five were exported to France, three were exported to India, six were exported to Mexico, five were exported to Saudi Arabia, one was exported to Sweden, two were exported to Trinidad, 10 were exported to Uruguay, and 57 were built for the U. S. Military.

As of 1900 (interpreted from Form CT1000), the Pennsylvania Railroad -- which did not include "Lines West of Pittsburgh" -- was organized into Grand Divisions, Divisions, and Railroads. Railroads represented in bold are included in the listings but are believed to be independent railroads (many are confirmed so).