The ALCO RS-27 (specification DL-640) is a diesel-electric locomotive built by ALCO between December 1959 and October 1962. Only 27 examples were manufactured. With ALCO's introduction of the Century Series line, the C-424 (specification DL-640A) replaced the RS-27 in the builder's catalog. Today, the Minnesota Commercial Railway has the only two RS-27s left in existence, although both have since been placed into storage.^[1]

ALCO RS-27
Minnesota Commercial Railway 318 at Minneapolis, July 2009
Type and origin Power type Diesel-electric Builder ALCO Model RS-27 Build date December 1959 – October 1962 Total produced 27
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) Trucks AAR type B Wheel diameter 40 in (1,016 mm) Minimum curve 21° Wheelbase 40 ft 4 in (12.29 m) Length 57 ft 2+1⁄2 in (17.44 m) Width 9 ft 11+1⁄8 in (3.03 m) Height 14 ft 6 in (4.42 m) Loco weight 256,800 lb (116,500 kg) Fuel capacity 2,000 US gal (7,600 L) Prime mover Alco 251B RPM range 1000 Engine type Four-stroke diesel Aspiration Turbocharged Displacement 10,688 cu in (175.14 L) Generator GE 5GT-581-B1 Traction motors (4) GE 5GE-752-E3 Cylinders V16 Cylinder size 9 in × 10.5 in (229 mm × 267 mm)
Performance figures Power output 2,400 hp (1.8 MW) Tractive effort 64,200 lb (29,100 kg)
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