ALCO RSD-7

Infobox Locomotive
name = ALCO RSD-7
powertype = Diesel-electric
builder = ALCO
buildmodel = RSD-7
totalproduction = 29
aarwheels = C-C
uicclass = Co'Co'
gauge = RailGauge|ussg
primemover = ALCO 244
cylindercount = V16
poweroutput = DL-600: 2,250 hp (1,700 kW)
DL-600A: 2400 hp (1800 kW)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 2250 hp (1700 kW); revised specification DL-600A, numbering 27 locomotives, was rated at 2400 hp (1800 kW). The RSD-7 was superseded by the ALCO 251-engined ALCO RSD-15, which looks very similar. [pinkepank diesel spotters guide 2]

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 six-motor design allowed better tractive effort at lower speeds.

References