David J. Mrozek is a retired financial analyst and has been interested in stations, interlocking towers, and other railroad support structures since the late 1960s. Between 1978 and 1986, he wrote a monthly column titled aDown at the Depota for the Michigan Railroad Clubas magazine, the Michigan Railfan. In 1986, he assumed responsibility the for clubas annual calendar, Michigan Rails, and oversaw its creation for the next 10 years. Railroad Depots of Michigan: 1910a1920 is his first book.