The ALCO Century 628 was a six-axle, 2,750 hp (2,051 kW) diesel-electric locomotive.

The C628 replaced the C624 (DL600C/RSD-41) as a part of ALCO's 'Century' line of locomotives.

The C624 was intended to replace the earlier RSD-15 model, but was never built.

[1] The Southern Pacific purchased the four demonstrators in 1964, and an additional 25 C628s were delivered in 1965.

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