The "DR-6-4-1500": Baldwin's A1A-A1A Passenger Model

Last revised: August 27, 2024

The DR-6-4-1500 was Baldwin's A1A-A1A design intended for passenger service. It was a direct competitor to Electro-Motive's successful "E" series and Alco's beautiful "PA" line

Unfortunately, Baldwin lagged far behind its rivals in the cab locomotive market. It struggled immensely to sell full-bodied diesels, either freight or passenger variants.

But, as John Kirkland points out in his book, "The Diesel Builders: Volume Three (Baldwin Locomotive Works," the DR-6-4-1500 was never actually a production-line model. It was built solely on the request of New York Central and Seaboard Air Line

Photos

Seaboard Air Line DR-6-4-1500 #2702 at Tampa, Florida. Ken Ardinger photo. Warren Calloway colorization.

Overview

The DR-6-4-1500, and later DR-6-4-2000, concluded Baldwin's development of passenger locomotives. Afterwards, the company primarily focused efforts on its cab freight locomotives, notably the RF16. Today, there are no examples of the DR-6-4-1500 preserved.

The Baldwin DR-6-4-1500 began production in November, 1947 and featured an A1A-A1A truck setup (i.e., the two outside axles were powered while the inside axle was not), perhaps the only difference from the earlier model which included simply a B-B truck setup.

Just like the DR-4-4-1500 model the design was equipped with 1,500 horsepower using Baldwin's new 608 SC prime mover.

It was the first engine built exclusively by the iconic manufacturer as its early VO660 and VO1000 models came equipped with prime movers from subsidiary I.P. Morris & De La Vergne which Baldwin had purchased in 1931.

Reception

The DR-6-4-1500 never made it to the redesigned "Shark Nose" carbody (designed by the firm Hadley, Ryder & Pedersen). The reasoning here, of course, was that no future orders were requested for this particular variant.

Only 10 were built by the time production had ended in the spring of 1948; 4 'A' units and 2 'B' units by New York Central and '3' A units by Seaboard Air Line (there was also one demonstrator built).

Baldwin's first classification system for its diesels did have purpose although sometimes it's hard to fathom considering the difficulty in trying to decipher it. When the company switched production to diesel locomotives it was still manufacturing some steam locomotives.

This setup persisted through the late 1940's. As a means of differentiating the two Baldwin came up with a steam locomotive-like designation system, similar to the Whyte Notation.

For instance, in regards to the DR-6-4-1500:

DR referred to Diesel Road unit

The first number, 6, designated 6 overall axles

The second number, 4, denoted four powered traction motors

1,500 classified the horsepower rating

To simplify the model was regarded merely as a DR-6-4-15. Given the problematic nature of the DR-6-4-15, and all early main line diesels produced by Baldwin, both the NYC and Seaboard did not retain their units long before trade in or outright scrapping them.

Data Sheet and Specifications

Entered Production	11/22/1947 (New York Central #3200-3201 [As] and #3300 [b])
Years Produced	11/22/1947 - 11/11/1948
Baldwin Class	DR-6-4-1500/1 SC
Engine	608SC
Engine Builder	De La Vergne
Horsepower	1500
Carbody Styling	Baldwin
Length (Between Coupler Pulling Faces)	61' (A unit), 59' 6" (B unit)
Weight	304,000 Lbs
Trucks	A1A-A1A
Truck Type	GSC Rigid Bolster-Inside Sideframe Equalizers
Truck Wheelbase	13' 3"
Wheel Size	42"
Traction Motors	370F (4), Westinghouse
Traction Generator	471A, Westinghouse
Auxiliary Generator	YG42A, Westinghouse
Gear Ratio	15:63 (SAL) and 22:57 (NYC)
Tractive Effort Rating	26,400 Lbs at 23.5 MPH
Top Speed	100 MPH

Production Roster

Total Built = 9

Owner	Road Number	Baldwin Serial Number (A Unit)	Baldwin Serial Number (B Unit)	Construction Number	Completion Date
New York Central	3200	1	-	73132	11/22/1947
New York Central	3300	-	1	73136	11/22/1947
New York Central	3201	2	-	73133	11/22/1947
New York Central	3202	3	-	73134	5/5/1948
New York Central	3301	-	2	73137	5/5/1948
Seaboard Air Line	2700	4	-	73396	11/28/1947
Seaboard Air Line	2701	5	-	73397	1/2/1948
Seaboard Air Line	2702	6	-	73398	1/11/1948

Sources

Kirkland, John F. Diesel Builders, The: Volume Three, Baldwin Locomotive Works. Pasadena: Interurban Press, 1994.

Pinkepank, Jerry A. Diesel Spotter's Guide. Milwaukee: Kalmbach Publishing Company, 1967.

Solomon, Brian. Baldwin Locomotives. Minneapolis: Voyageur Press, 2009.

Virtually all were off both companies' roster by the 1960s. When Baldwin uprated its primary diesel engine and dropped steam production entirely the company overhauled its locomotive line.

It dropped the "Whyte Notation" classification system and adopted a much simpler protocol for naming new models. The "Standard Line" was much more successful than Baldwin's first generation of diesels.

It is interesting to wonder what may have been had parent Westinghouse continued in the locomotive market. If Baldwin had remained an independent company at the time it almost surely would have continued refining its product.