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Catalog No. 112
Category Steam Locomotive
Description 4-6-4 Hudson (AC)
Catalog References at myflyertrains.org 1940 1941  
Remarks

Characteristics 

Boiler Shell
Detailed (headlight)


Reverse Unit
DC Relay type
Drivers
A.  Bakelite with Brass rims
B.  Die cast with insulator

Couplers
Truck mounted
According to Charles Sommer's Guide, all prewar Hudsons utilize an  AC motor with a spur gear drive.  Some may have been converted to DC power by substitution of a permanent magnet for the field coil, as shown below.  Some writers have indicated that beginning in 1939 a vertical worm gear drive with an AC motor was used but this appears to be incorrect.  The reverse unit is DC pulse activated, as was used in prewar Flyer O gauge, rather than a sequence type.  The switch to truck mounted couplers coincided with the change in the Gilbert track radius from 24" to 16".  Number under cab is a prototype number.  Model number does not appear on unit.
 

112agk.jpg (46794 bytes)Bakelite driver version - Gary Klein Collection

112 Diecast Driver Version
Diecast driver version - Courtesy of Joe King
Detail view of diecast driver locomotiveDiecast driver closeup - Courtesy of Joe King

View of Motor & GearingPhoto by David E. Crowe

This photo shows a standard Gilbert prewar AC motor with spur gearing.  The drivers on this particular locomotive appear to be brass rimmed bakelite.  This chassis came with a detailed boiler casting and is either a later model 200 or a model 112.
Inside View of Permanent Magnet ReplacementDom San Giovanni Collection
This photo shows a Gilbert prewar motor converted to DC operation by replacement of the field coil with a permanent magnet.   Such conversion kits were offered by Mantua and Quaker City Model Railroad Shop. (Source: American Flyer HO by Charles J. Sommer)  While not as obvious as the previous photo above, this engine also has brass rimmed bakelite drivers and could be either a later model 200 or a model 112.
112.jpg (43143 bytes)
 
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