Ted Hollow, of Balboa Scale Models, introduced a new line of HO scale plastic kits to the trade in June 1968. A few weeks later, much to the embarrassment of Tom Ayres who put together the packaging and marketing plan for Hollow, the brand name was challenged by another manufacturer and Train-Master was quickly renamed Train-Miniature. 

There is more to the story if you are interested, but it is too long to be posted here.

Richard Bale