Twin Diesel sets are known to exist for the Shark Nose and F-9 models.

A pair of silver Amtrak F-9A units was included in this Twin Diesels set.  One powered example and a matching dummy, both carrying roadnumber 4316.

This Twin Diesels set included a pair of BN Sharks with one powered and one non-powered.

Found in TYCO's 1977 catalog is a pair of Chessie System F-9A units, powered and dummy, with a retail of $19.

This Twin Diesels set included a pair of D&H Sharks with one powered and one non-powered.

The TYCO box flap description for this set is bit redundant, Shark Nose Powered & Non-Powered Dummy New York Central.

This pair of Santa Fe F-9A units included a powered and non-powered example and was listed in TYCO's 1975-76 catalog.  The set is listed with a $19 retail price.

This set included a powered and a non-powered example of TYCO's Southern Pacific Shark Nose Diesel in the Daylight scheme.

Though the majority of TYCO's Brown Box Era locomotives come from Hong Kong according to their fuel tanks, these Spirit of '76 F-9's are known to have Austria as the country of origin on their tanks.  Cataloged in the 50th Anniversary 1976 edition, this pair of a powered and non-powered Spirit of '76 F-9A units retailed for $19.  JCPenney includes the twin Spirit of '76 F-9A units in their 1976 Christmas catalog.  The JCPenney stock number for this set was #X 926-1546 A and they sold for $14.99 from Penney's.

Two Union Pacific F-9A units, one powered and one dummy, made up this TYCO Twin Diesels set.  TYCO included the Amtrak (No.248-07) and Santa Fe (No.248-21), along with this Union Pacific pair in the 1975-76 catalog.  Like the others, this set retailed for $19 that year.