SP RS32 4001
- Group: SP 7300-7309
- Railroad class: AF424-1
- Builder number: Alco 84026
- Order number: Alco S3344
- Builder date: March, 1962
- Phase: I
- Horsepower: 2400
- Prime mover: Turbocharged Alco V12 251C
- Main generator: General Electric GT581D2
- Traction motors: Four General Electric GE752
- Production: 35 units between June, 1961 and June, 1962
- SP ownership: 10 units
Southern Pacific 7301 > Southern Pacific 4001 > Fundidora Monterrey 4001
Built as Southern Pacific 7301 in March, 1962, part of a single order for ten units, and renumbered Southern Pacific 4001 in the 1965 general renumbering. It was retired in May, 1977, and sold to Chrome Crankshaft 1001 in November, 1978. It again sold to Fundidora Monterrey 4001, Monterrey, Nuevo León, Mexico.
- Digital Rail Artist – Southern Pacific Alco RS32 roster
- Digital Rail Artist – Alco RS32 builder list and phases
- Joseph A. Strapac, Southern Pacific Diesel Locomotive Compendium, Volume 2: Post-1965 SP and Cotton Belt Numbers Union Pacific Transition, Shade Tree Books, 2007, pg 165