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Brown Box Era HO-Scale Trains
F-9B Diesel Locomotive
TYCO Penn Central F-9B

F9-B Diesel Locomotive
Penn Central 

TYCO Santa Fe Passenger F-9B Diesel Locomotive

F9-B Diesel Locomotive
Santa Fe
No. 230H
No. 230-21
 
From the beginning of the Brown Box Era, TYCO used a letter suffix designation on stock numbers to note roadnames, this changes with the 1975-76 catalog.  As of the 1975 listings, TYCO uses the two-digit suffix to model numbers to note a loco or freight car's roadname.  The Santa Fe F9-B would have been TYCO's 230H item, until the '75 system change made it 230-21.  The Santa Fe F9-B is last listed in a TYCO catalog in 1976.

As with TYCO's F-9A, the B or Booster unit is really a late phase F-7B, but was cataloged always as an F-9B.
 
During the "Red Box Era" prior to 1970, the B-unit can be found in a wide variety of roadnames and in Powered and Non-Powered versions.  During the "Brown Box Era" of the '70s, TYCO only officially catalogs a Santa Fe Passenger F-9B unit.  Collectors should note that other roadnames do appear for the F-9B in the famous TYCO "Brown Boxes," among them are a bright-green Penn Central offering.
 
The F-9B didn't fare as well as its A-unit counterpart under the Consolidated Foods ownership of TYCO. The F-9B last appears in the 1976 catalog.  Mantua re-introduces this loco during its second run in HO-scale model trains from 1978 through 2001.

Mantua's B-units...

MANTUA

MANTUA Rock Island Rocket F-7A and F-7B

From the 1990's, MANTUA's Rock Island Rocket-scheme F-7A and F-7B units.  Notice MANTUA has cast a full frame for the A-unit and the slots on the sides of the shell are gone.  The B-unit however still has its slots and appears to not have been altered for this production run.

In 1977 the Tyler family purchased back the original line of HO-scale trains from then TYCO owner Consolidated Foods/Sara Lee.  The F-9B Diesel Locomotive was among the items that became part of this second generation of Mantua trains.  Though not part of the first offerings from Mantua in the late '70s, the B-unit was sold during the '80s through 2001.  The TYCO F-unit was always labeled an F-9, in reality the model is closer to the F-7 prototype.  Mantua refers to its F-units, both A's and B's, as F-7s during the second generation of Mantua trains.