ALCO Century 636

ALCo Century 636
RPRX 78, now NYSW 3660 is on the point of SU-100 at Ridgefield Park, New Jersey, September 2005.
Type and origin Power type Diesel-electric Builder ALCo, AE Goodwin (licensee) Model Century 636 Build date December 1967 – September 1970 Total produced 63
Specifications Configuration: ​  • AAR C-C Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Prime mover Alco 16-251F Engine type V16 diesel engine Cylinders 16
Performance figures Power output 3,600 hp (2.7 MW)
Career Disposition Most scrapped, some rebuilt, 1 preserved

The ALCo Century 636 was the most powerful single-engine diesel-electric locomotive constructed by the American Locomotive Company (ALCo). It used their 251 prime mover. The locomotive had a C-C wheel arrangement and 3,600 horsepower (2,700 kW). The locomotive rode on a pair of trucks of all-new design, known as the Hi-Ad, standing for 'high adhesion'. Visually, it is similar to the Century 630, but can be distinguished by the intercooler box. The C630 has two grilles on the intercooler box, one above the other, whereas the C636 only has the upper grille.