N gauge/n scale models under the Minitrix brand were made from the late 1960s mostly of European prototypes (German and British primarily). North American prototypes were also manufactured and marketed under the Aurora "Postage Stamp" brand; later these items were sold under the American Tortoise, Model Power and Con-Cor brands. Trix sometimes utilized North American consultants to aid in the design of this portion of the product line. The "Hornby Minitrix' brand was used in the 1980s for a short lived range of British outline models using the earlier product tooling.
Trix's owner in the 1980s and 1990s was Mangold, which went bankrupt in the late 1990s and Märklin purchased the assets in January of 1997. In part, this purchase was a reflection of Märklin's need for added production capacity; Trix had been manufacturing certain items for Märklin in previous years. But the purchase was also in response to the earlier purchase of the Karl Arnold company by the Italian company Rivarossi. In 2003, Märklin introduced its first N gauge models under the Minitrix brand. Several Märklin HO scale three-rail AC locomotives have also been introduced in two-rail DC versions under the Trix logo.
The Minitrix brand is very popular in the USA.
What's it worth? Take a look at this Minitrix price guide: sold listings for a value indication.