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ALCO Century 420
Penn Central 
No.5173-D

ALCO Century 420
Santa Fe 
No.5173-B

ALCO Century 420
Union Pacific
No.5173-C

To date, I have never encountered an AHM HO-scale Century 420. The three roadnames and the stock numbers presented here are from a mid-'70s AHM price listing and no pictures were provided with it.

My guess is that this would have possibly been the Lima-Italy Century 420. The Lima Century 420 did find itself available in the 1970s in the U.S., but it was sold by Model Power/PMI and not AHM. For a time in the '70s Model Power had a secondary line under the PMI, Precision Models Inc., name and this line included what I believe is the first American release of the Century 420. The February 1976 issue of Railroad Model Craftsman includes a product review of this Italian-made loco. The PMI roster included the trio of roadnames promised from AHM (ATSF, PC, and UP), plus Canadian Pacific.

By the 1977 catalogs and price listings, AHM no longer mentions this model Century 420.

As a Model Power/PMI release, the Lima Century 420 was available decorated for Santa Fe, Union Pacific, Penn Central, Canadian Pacific, Spirit of '76, and Chessie.

Lima also sold the model under its own name and it was available here in the U.S. from them. There is an interesting Southern Pacific Daylight experimental scheme found on a Lima boxed Century 420 model.

You may read more about the history of ALCO at Wikipedia.org.

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.