ALCO RSD-7

The ALCO RSD-7 was a diesel-electric locomotive of the road switcher type built by ALCO at Schenectady, New York between January 1954 and April 1956. Two versions were built, with the same RSD-7 model designation but different specifications and power ratings, although both used the ALCO 244 engine in V16 configuration. Specification DL-600, of which only two were built, developed 2,250 hp (1,678 kW; 2,281 PS) and used the 244G engine. The revised specification DL-600A, numbering 27 locomotives, was rated at 2,400 hp (1,790 kW; 2,433 PS) and used the 244H engine. The RSD-7 was superseded by the ALCO 251-engined ALCO RSD-15, which looks very similar. The RSD-7 was the last ALCO diesel built with a 244 engine.

ALCO RSD-7
RSD-7 demonstrator DL-600, the first example built by ALCO.
Type and origin
Power typeDiesel-electric
BuilderALCO
ModelRSD-7
Total produced29
Specifications
Configuration:
​
 • AARC-C
 • UICCo′Co′
Gauge4 ft 8+1⁄2 in (1,435 mm)
Prime moverAlco 244
CylindersV16
Performance figures
Power outputDL-600: 2,250 hp (1,678 kW; 2,281 PS)
DL-600A: 2,400 hp (1,790 kW; 2,433 PS)
Career
DispositionAll scrapped

Both rode on a pair of three-axle trucks with all three axles on each truck powered; this is a C-C wheel arrangement. These trucks have an unequal axle spacing due to traction motor positioning; the outer two axles on each truck are closer together than the inner two. The RSD-7 used the GE 752 traction motor. The six-motor design allowed better tractive effort at lower speeds.

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