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Bowker 2-4-0 Steam Engine
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"Santa Fe" Class S-1 2-10-2 Steam Engine
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2-8-8-2 Y6B Mallet Steam Engine
Norfolk & Western
No. 5092 -1965 Release
No. 5090-D
No. 5092-B -1977 Release with .039 flanges
No. 17511

2-8-8-2 Y6B Mallet Steam Engine
Pennsylvania Railroad
No. 5090

2-8-8-2 Y6B Mallet Steam Engine
Santa Fe
No. 5091
No. 5090-C
No. 17512

2-8-8-2 Y6B Mallet Steam Engine
Simulated Gold
No. 5093 -$55.98

2-8-8-2 Y6B Mallet Steam Engine
Undecorated
No. 5092-C -1977 Release with .039 flanges 

AHM 2-8-8-2 Y6b

AHM adds its Norfolk & Western Mallet 2-8-8-2 Y6b in mid-1965. The original asking price for the Rivarossi-made steam engine was $39.95.

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Today's HO-scale modelers probably give no thought to the depth of the flanges on wheels. As you'll see in this 1977 ad from AHM, flanges were becoming an issue as the HO-scale market continued to get more serious and prototypically concerned. Many of AHM's releaes up to this time featured deep flanges with a .050 measurement. Generally, it was the Rivarossi made releases that suffered from the deep flange issue. As noted, this 1977 re-release of the impressive N&W Y-6B Mallet was an experiment for AHM to gauge reaction to smaller .039 flanges.
What's the difference? The deep flanges are a non-issue on Code 100 HO-scale track, but attempt running an older loco with deep flanges on Code 83 track and you'll see and hear the problem. The deep flanges will bump along on the ties, as the more accurate high Code 83 track is not tall enough to clear the flange height.

Image sources include AHM product catalogs and advertisments, as well as images from eBay auctions and other sources. Information presented comes from variety of sources including product catalogs, magazine articles and Wikipedia.