© trainspo.comALCo RS-3m
Built by ALCo, MLW
Overview of the ALCo RS-3m
Discover the robust RS-3m diesel locomotive, a versatile workhorse with a rich operational history in the United States.
This locomotive, identified by its Bo'Bo' classification, has served prominent railroads such as the Housatonic Railroad, Maryland and Delaware Railroad Company, and the Missouri Pacific.
Built between 1956 and 1978 by ALCo and MLW, the RS-3m features a standard 1435 mm gauge, making it a common sight on North American rail lines.
Explore images and details of this reliable diesel locomotive, a testament to enduring railway engineering.
ALCo RS-3m technical specifications
| Value | Imperial / US | |
|---|---|---|
| Series | RS-3 | |
| Built by | ALCo, MLW · 1956–1978 | |
| Track gauge | 1,435 mmStandard gauge4 ft 8½ in | |
| UIC axle arrangement | Bo'Bo' |
Operators of the ALCo RS-3m
Railway companies that have operated the RS-3m, with the class designation used by each of them.
| Operator | Class | Country |
|---|---|---|
| Housatonic Railroad | HRRC RS-3m | United States |
| Maryland and Delaware Railroad Company | MDDE RS-3m | United States |
| Missouri Pacific | MP RS-3m | United States |
ALCo RS-3m photos
Photos © their respective authors, shared on trainspo.com. They may show liveries or variants that differ from the specifications above.
More diesel locomotives from ALCo

ALCo
CRSD20
Diesel locomotive
1956–1960

ALCo
DL600B
Diesel locomotive
1956–1960 · 105 km/h

ALCo
RS-11 / DL-701
Diesel locomotive
1956–1964 · 1,300 kW

ALCo
SSB-9
Diesel locomotive
1956 · 670 kW

ALCo
S6
Diesel locomotive
1955–1960

ALCo
T-6 (DL 440)
Diesel locomotive
1958–1969

ALCo
MRS-1
Diesel locomotive
1953–1954

ALCo
S13
Diesel locomotive
1959–1967
Similar diesel locomotives from other manufacturers

Brissonneau and Lotz
BB 63500
Diesel locomotive
1956–1971 · 90 km/h

Brissonneau and Lotz
CFL 850
Diesel locomotive
1956

Clyde Engineering
G8B/DE0x
Diesel locomotive
1956

Cockerill
SNCB 83
Diesel locomotive
1956 · 50 km/h

GMD
GR12UM
Diesel locomotive
1956–1960

Goninan
UM-118T
Diesel locomotive
1956–1957 · 114 km/h

Kockums
Z67
Diesel locomotive
1956–1958

Krauss-Maffei
V 200.0
Diesel locomotive
1956–1958 · 140 km/h