ALCo / M-K RS-3m

RS-3 units #4115, #4106, #4107, #4113, #4122, #4112, #4119, and #4128 were rebuilt by Morrison-Knudsen into RS-3m units (numbered #501-508, respectively) between December of 1975 and March of 1976. The locomotives were re-engined with the 2,000 horsepower ALCo 12-cylinder 251C engine, and the long hood was raised six inches to accommodate the larger engine. The dynamic brakes were also moved to a box behind the cab. This class was also known by their M-K designation of TE56.

D&H RS-3m #506 sits in Binghamton, NY on the night of July 7, 1990. Reuben S. Brouse photo, The Garbely Publishing Company collection

D&H RS-3m #506 made its way to the Livonia, Avon & Lakeville, and underwent an overhaul in 2015 before being painted into the corporate colors. It it viewed here in the Western New York & Pennsylvania’s shops in Olean, NY on August 28, 2015. Rudy Garbely photo

Delaware & Hudson Railway
ALCo / M-K RS-3m Roster (Class ARS-20m)
No.ModelBuilderSerialBuiltRetiredNotesPhotos
501RS-3mALCo/
M-K		803159/19523/1988Built as RS-3 #4115, rebuilt by M-K in 1975-76 to
RS-3m #504		Link
502RS-3mALCo/
M-K		803069/19523/1988Built as RS-3 #4106, rebuilt by M-K in 1975-76 to
RS-3m #502		Link
503RS-3mALCo/
M-K		803079/19523/1988Built as RS-3 #4107, rebuilt by M-K in 1975-76 to
RS-3m #503		Link
504RS-3mALCo/
M-K		803139/19523/1988Built as RS-3 #4113, rebuilt by M-K in 1975-76 to
RS-3m #504		Link
505RS-3mALCo/
M-K		805248/19533/1988Built as RS-3 #4122, rebuilt by M-K in 1975-76 to
RS-3m #505		Link
506
(1976)		RS-3mALCo/
M-K		803129/19523/1988Built as RS-3 #4112, rebuilt by M-K in 1975-76 to
RS-3m. Delivered in bicentennial colors as #1976,
later renumbered back to #506.		Link
507RS-3mALCo/
M-K		8031910/19523/1988Built as RS-3 #4119, rebuilt by M-K in 1975-76 to
RS-3m #507		Link
508RS-3mALCo/
M-K		805308/19533/1988Built as RS-3 #4128, rebuilt by M-K in 1975-76 to
RS-3m #508		Link
 
ALCo / M-K RS-3m Data
Engine12-cylinder 251C
TrucksB-B
Truck TypeAAR Type B
Fuel (gals.)
Sand (cu. ft.)
Weight (lbs.)
Horsepower2000 hp
Traction Motors
Tractive Effort56,000 lbs.
Gearing
 

D&H 501
In Lightning Stripe at Mechanicville in March, 1977. Kevin Endriss photo

D&H 502
In Lightning Stripe at Mechanicville in March, 1977. Kevin Endriss photo

D&H 503
In Lightning Stripe at Mechanicville in October, 1980. Kevin Endriss photo

D&H 504
In Lightning Stripe at Mechanicville in March, 1977. Kevin Endriss photo

D&H 505
RS-3m #505 and #508 (and a C420) head a Delaware & Hudson train southbound just north of Binghamton, NY in this September 1983 view. Photo by Gary Zuters, scan by John Reay.

D&H 505 In Lightning Stripe at Mechanicville in January, 1978. Kevin Endriss photo

D&H 505
In Lightning Stripe at Mechanicville in January, 1978. Kevin Endriss photo

D&H 506 (1976)
Along with U23B #2312, RS-3m was painted into a Red, White and Blue scheme to commemorate the Bi-Centenary of the U.S.A. in 1976. The loco was renumbered 1976, and returned to its original number (506) after the Bi-Centenary celebrations. George Elwood photo

D&H 506 (1976) In bicentennial at Oneonta in May, 1976. Kevin Endriss photo

D&H 506 (1976)
In bicentennial at Oneonta in May, 1976. Kevin Endriss photo

D&H 506 In bicentennial at Mechanicville in May, 1979. Kevin Endriss photo

D&H 506
In bicentennial at Mechanicville in May, 1979. Kevin Endriss photo

D&H 506
At Binghamton, NY in November 1986. Bill Mischler photo

D&H 506
At Rouses Point, NY in 1979. Tim Byrne photo

D&H 507
In Lightning Stripe at Oneonta in March, 1977. Kevin Endriss photo

D&H 508
In Lightning Stripe at Oneonta in May, 1976. Kevin Endriss photo

D&H 508 Unit #508 is a little the worse for wear, shown at Colonie, NY, awaiting an overhaul in February 1981. Photo by Neil C. Hunter.

D&H 508
Unit #508 is a little the worse for wear, shown at Colonie, NY, awaiting an overhaul in February 1981. Photo by Neil C. Hunter.