California's Railroad to the U.S. 1861 - 1996

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Model Train Help EBook

Southern Pacific
'Cab - Forward'
Class AC-4

10 units built

4100 4101 4102 4103 4104 4105 4106 4107 4108 4109

The first 9 AC-4 class engines were built in 1928 and the last one in 1929 by Baldwin. These had a boiler pressure of 235lbs, a weight of 614,600lbs and a tractive effort of 116,900lbs.

According to a note on the SP lettering drawing dated 12/30/49 all AC class engines assigned to Sacramento, Shasta, Portland, and San Joaquin Divisions shall omit the large SOUTHERN PACIFIC on the tender sides, also F class engines on Shasta Division. Photo evidence shows that this was often but not always the case. Charles Givens

All scrapped by 1955.


  • A Century of SP Steam Locomotives - Guy L. Dunscomb
  • SP Co. Steam Locomotive Compendium - Diebert & Strapac
  • Cab-Forward - Robert J. Church
  • Cab-In-Front (The Half Century Story of An Unconventional Locomotive) - John.B.Hungerford © 1959
    • reprinted by PFM 1974

Modeling choices at the moment are:

  • For N Scale:
    • ?
  • For HO Scale:
    • Broadway Limited AC-4
  • For S Scale:
    • ?
  • For O Scale:
    • ?

Articulated Index

Home Steam Loco Index SP MoW Index Diesel Loco Index Diesel Roster Index
Freight Car Index Passenger Car Index Structure Index Depot Index
Feed Back Caboose Index DRGW Index Miscellaneous Freight Car Spec Sheets
Data Index PicIndex Diesel Model Info
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This document © 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008. Richard.A.Percy

Saturday, 13 May 2006