Pentrex

Pentrex Media Group, LLC, is an American producer and seller of railfan-related videos and DVDs, founded in 1984 and currently based in Pasadena, California. The company discontinued the sale of VHS video tapes on July 31, 2009.

Until 1999, Pentrex also published books and magazines, and its magazine editorial offices were located in Waukesha, Wisconsin. It continues to sell books and back issues of its defunct magazines, but no longer publishes any. In 1993, the company acquired Glendale-based Interurban Press, a publisher of books primarily about streetcars, interurbans and trolley buses, in business since the 1940s. Initially, Pentrex continued publication of books and all of the magazines it had acquired from Interurban Press, but these were gradually phased out, as the company concentrated on production and sales of videos and, later, DVDs.