4-8-8-2 "Cab Forward" Locomotives in the USA

Cab Forward Facts and Trivia

Cab Markings

What did those Cab Forward cab markings mean?

2424
AC-4AC63          475 SF
32
AC-4Class designation
AC63Articulated Consolidation, 63 inch drivers
24 24Cylinder diameter (front and rear) in inches
32Piston stroke in inches
475Weight on drivers in thousands of pounds
SFSuperheated, Feedwater heater

The Monkey Deck

Monkey Deck
Monkey Deck
The Southern Pacific Cab Forwards had a platform immediately following the smokebox of the locomotive (as shown in the figure to the right). This platform was called the "monkey deck. Smoke boxes were often stained with rust from boiler water and boiler water treatment chemicals. Because of its proximity to the stacks, the monkey deck was often stained with rust from boiler water too. Occasionally articulateds would spew hot water and mud from their stacks. Most railroad employees were aware of this fact. However, many hoboes thought the monkey deck was a good place to ride. After passing through tunnels or snow sheds, hoboes riding the deck were either scalded or asphyxiated depending upon how the locomotive was performing. The monkey deck was not a good place to ride on Cab Forward locomotives.

Southern Pacific Yellowstones

Not all Southern Pacific articulateds were Cab Forwards. Class AC-9 was made up of 12 Lima built Superpower, coal burning Yellowstones (2-8-8-4). They had the same tractive effort of the Cab Forwards. They were numbered 3800 - 3811 and were used in the Southwest.

Cab Forward Classes

ClassLocomotive
Number
Wheel
Arrangement
Driver
Diameter
CylindersSteam
Pressure
Tractive
Effort
Horse
Power
MC-14000-40012-8-8-25726x40x3020085,0404000
MC-24002-40162-8-8-25726x40x3020085,0404000
AC-14000-40162-8-8-25722x22x3021090,9404350
MC-44017-40282-8-8-25726x40x3020085,0404000
AC-24017-40282-8-8-25722x22x3021090,9404350
MC-64029-40482-8-8-25726x40x3020085,0404000
AC-34029-40482-8-8-25722x22x3021090,9404350
MM-24200-42114-6-6-26325x38x2820065,9003000
AM-23900-39114-6-6-26322x22x2821076,8003450
AC-44100-41094-8-8-26324x24x32235116,9005640
AC-54110-41254-8-8-26324x24x32235116,9005640
AC-64126-41504-8-8-26324x24x32250124,3006000
AC-74151-41764-8-8-26324x24x32250124,3006000
AC-84177-42044-8-8-26324x24x32250124,3006000
AC-9*3800-38112-8-8-46324x24x32250124,3006000
AC-104205-42444-8-8-26324x24x32250124,3006000
AC-114245-42744-8-8-26324x24x32250124,3006000
AC-124275-42944-8-8-26324x24x32250124,3006000
NOTE: Class AC-9 were Yellowstones (not Cab Forwards)

The Last Cab Forwards


Railroads that used 4-8-8-2 "Cab Forward" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media)

Surviving Examples of 4-8-8-2 "Cab Forward" Locomotives in the USA

No.ClassF.M. WhyteGaugeRailroad LineLocationStatusBuilder InfoNotes
4219AC-104-8-8-24'-8½"SP Oregon Rail Heritage Center, Portland, ORoperationalBaldwin #64310, 1942Tender only. Used as an auxiliary tender behind 4449. Engine sold for scrap in 1958.
4294AC-124-8-8-24'-8½"SP California State Railroad Museum, Sacramento, CAdisplayBaldwin #70101, 1944Last Cab-Forward built for the SP.

Web Pages

Reference

All material Copyright © SteamLocomotive.com
Wes Barris