The American Locomotive Company (ALCO) produced a wide range of diesel locomotives until it ceased manufacture in 1969. This list is broken out of the main article to prevent it growing unwieldy.

Table of contents
1 Early switchers (HH series)
2 Later switchers (S series)
3 Early roadswitchers (RS, RSC, RSD series)
4 Cab units
5 Century series
6 8-axle units
7 Miscellaneous

Early switchers (HH series)

Later switchers (S series)

  • S-1 and S-3 (identical but for trucks)
  • S-2 and S-4 (identical but for trucks)

Early roadswitchers (RS, RSC, RSD series)

RS series (B-B)

RSC series (A1A-A1A)

  • RSC-1
  • RSC-2
  • RSC-3

RSD series (C-C)

  • RSD-1
  • RSD-4
  • RSD-5
  • RSD-7

Cab units

  • DL-109 - early A1A-A1A primarily passenger locomotives
  • FA - (FA-1,2,3) B-B cab (primarily) freight units
  • PA - (PA-1,2,3) A1A-A1A passenger locomotives

Century series

ALCO announced its "Century Series" of diesel locomotives in 1963 as a leap forward in power and reliability, an attempt to compete more aggressively with GM-EMD in the marketplace.

4-axle units

  • Century 415
  • Century 420
  • Century 424
  • Century 425
  • Century 430

6-axle units

  • Century 628
  • Century 630
  • Century 636

8-axle units

  • Century 855 - Twin-engined 5500 hp locomotive for Union Pacific, 3 built

Miscellaneous