All About Postage Stamp Trains
While they were announced in 1969, I believe they reached the market no earlier than 1970. Thus, to my knowledge, they were never released under the Postage Stamp Trains brand, which may explain why a number of train sets were never released as well.
In the early 1970s, American Tortoise became the sole importer of these locos, which were sold under the Minitrix and Model Power brands. Production continued until the late 1990s, when Trix went bankrupt, and their new owner, Märklin, ended production of all North American models. American Tortoise ran advertisements such as this:
Return to: Locomotives
Postage Stamp Trains is a Trademark of the Aurora Plastics Corporation.