GE "ES44C4" Locomotives: Data, Specs, Roster

Last revised: December 31, 2024

After Baldwin and American Locomotive stopped production of A1A-A1A road-switchers in the 1950s, no one suspected they would ever return.

Few railroads had shown interest at the time and the advantages of six-motored locomotives largely outweighed any advantage of the A1A-A1A design.

However, thanks to microprocessors and computers which now monitor and control almost all aspects of diesel locomotive operation, the concept made a comeback.

In 2009 General Electric unveiled the ES44C4 as part of its Evolution Series locomotives which were equipped with the company's latest prime mover to meet the Environmental Protection Agency's (EPA) Tier II emissions standards.

Many viewed the concept's return as an interesting novelty while GE had a very concise reason for developing an A1A-A1A design, ending production of DC traction locomotives.

In the end, only two railroads showed interest, BNSF Railway and regional Florida East Coast. The western Class I, however, wound up with an impressive fleet of 1,119 units while the FEC picked up another 24.

Photos

BNSF ES44C4 #6866 leads a special military engineering battalion convoy eastbound near Siberia, California. Loyd Lowry photo.

Background

The first diesel-electric intended for rugged main line service to feature the A1A-A1A wheel arrangement was Electro-Motive EA of 1937, a locomotive built exclusively for the Baltimore & Ohio.

The model kicked off EMD streamlined passenger line, all of which were equipped with A1A-A1A wheel arrangements. The first road-switcher intended for the daily grind of freight service to feature such is credited to both American Locomotive and Baldwin.

As historian John Kirkland notes, the former completed its first RSC-2 on October 2, 1946 (Milwaukee Road #975) and the latter did the same just six days later when the first domestically built DRS-6-4-1500 rolled out of Eddystone (Columbus & Greenville #601).

In this era, long before computers were an integral part of locomotive operation, the A1A-A1A design was largely marketed for branch service.

In the 1940s and 1950s, Class I's operated thousands of miles of secondary lines serving a multitude of local customers.

Many featured rail of less than 100 pounds (per yard) and/or wood-pile bridges. Neither could handle heavy loads and an A1A-A1A road-switcher was designed to decrease the axle loading on these lines.

BNSF ES44C4 #6952 leads a westbound priority intermodal freight past the FS Grain, LLC complex at Ransom, Illinois. Loyd Lowry photo.

A1A-A1A Trucks

Some railroads found interest in the arrangement but overall it was a poor seller. Fast forward nearly 70 years and the A1A-A1A design had returned thanks to General Electric.

It was a radical departure, however, from the original concept. What GE dubbed the ES44C4 was in no way intended for light branch line service.

This was a heavy haul power plant designed for the daily grind of main line freight service. It was more than 60% heavier and could produce a continuous tractive effort more than twice that of either an RSC-2 or DRS-6-4-1500.

As Greg McDonnell notes in his book, "Locomotives, The Modern Diesel & Electric Reference: 2nd Edition," GE's purpose behind the ES44C4 was predominantly an effort to eliminate production of the less-efficient DC traction road-switchers.

The locomotive was equipped with AC traction motors but only on the lead and trail axles. The center axle was unpowered, and thus an A1A-A1A wheel arrangement.

Thanks to modern electronics and microprocessors, GE came up with a nifty way to offer a locomotive with the same pulling characteristics of a DC traction variant while saving on maintenance costs and increase service periods.

What the company dubbed its Dynamic Weight Management System, Mr. McDonnell's book notes that "the computer redistributes the load from the unpowered center axles onto the powered 1, 3, 4, and 6 axles as demand warrants."

It is achieved through air cylinders mounted on the trucks and is only in operation at low speeds. BNSF acquired its massive fleet over a six year period between 2009-2015.

Data Sheet

Entered Production	1/2009 (BNSF #6600)
Years Produced	1/2009 - 6/2015
GE Class	ES44C4
Engine	GEVO-12 (12 cylinder)
Engine Builder	General Electric
Horsepower	4400
RPM	1050
Length	73' 2"
Height (Top Of Rail To Top Of Cab)	15' 5"
Width	10' 3"
Weight	416,000 Lbs
Fuel Capacity	5,000 Gallons
Air Compressor	3CDC (Westinghouse)
Air Brake Schedule	26L (Westinghouse)
Trucks	A1A-A1A
Truck Type	Hi-Ad Bolsterless
Truck Wheelbase	13' 2"
Wheel Size	42"
Traction Motors	GEB13 (4), GE
Traction Alternator	GMG205, GE
Auxiliary Alternator	GYA30A, GE
MU (Multiple-Unit)	Yes
Dynamic Brakes	Yes
Gear Ratio	83:20
Tractive Effort/Starting	144,000 Lbs
Tractive Effort/Continuous	105,000 Lbs at 13.7 mph
Top Speed	75 mph

Production Roster

(Total Built = 1,137)

Owner	Road Number	Serial Number	Order Number	Completion Date	Quantity
BNSF Railway	6600-6624	59719-59743	1933	1/2009-3/2009	25
BNSF Railway	6625-6652	60183-60210	1969	1/2010-3/2010	28
BNSF Railway	6653-6789	60323-60459	1980	3/2011-9/2011	137
BNSF Railway	6870-6889	60527-60546	1800	12/2012	20
BNSF Railway	6790-6849	60547-60606	1800	9/2011-11/2011	60
BNSF Railway	6850-6869	60814-60833	1980	1/2012-2/2012	20
BNSF Railway	6900-7054	60834-60988	1800	2/2012-6/2012	155
BNSF Railway	7055-7099	61201-61245	1800	7/2012	45
BNSF Railway	6508-6599	61421-61512	1811	1/2013-4/2013	92
BNSF Railway	7100-7109	61523, 61514-22	1811	1/2013-3/2013	10
BNSF Railway	7110-7181	61524-61595	1811	3/2013-9/2013	72
BNSF Railway	7182-7199	62056-62073	1819	1/2014	18
BNSF Railway	8006-8274	62080-62348	1819	1/2014-11/2014	269
BNSF Railway	8275-8291	62546-62562	1819	11/2014	17
Florida East Coast	800-823	62699-62722	1832	10/2014-2/2014	24
BNSF Railway	7921-30, 7936	63003-63012, 63018	1842	12/2014	11
BNSF Railway	7938-7999	63020-62081	1842	12/2014-6/2015	62
BNSF Railway	8318-8399	63082-63163	1832	1/2015-6/2015	72

Sources

McDonnell, Greg. Locomotives: The Modern Diesel & Electric Reference, 2nd Edition. Buffalo: Boston Mills Press/Firefly Books, 2015.

Solomon, Brian. GE and EMD Locomotives: The Illustrated History. Minneapolis: Voyageur Press, 2014.

Kirkland, John F. Diesel Builders, The: Volume Two, American Locomotive Company And Montreal Locomotive Works. Glendale: Interurban Press, 1989.

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

Interestingly, an unlikely customer appeared for the model, Florida East Coast. The FEC, a successful regional serving the Atlantic coast of its home state had long been an Electro-Motive stalwart, even acquiring new SD70M-2's in 2006.

However, interested in the cost and operational savings of the ES44C4, the FEC picked up 24 examples in the fall of 2014.

Interestingly, no other railroad found took the plunge and acquired the model although by the 2010's few were buying DC traction locomotives.

Following completion of the final ES44DC's in 2010 for Canadian National, GE concluded production on the DC traction locomotives. Today, the ES44C4's owned by BNSF and the FEC remain in regular service.