sentences:  In the mid-1980s, he began a regular monthly column called "Trains of Thought" in the pages of "Model Railroader", published by Kalmbach.After twenty years editing telecommunication journals, Koester took on more work with Kalmbach, and became the editor of the annual "Model Railroad Planning", a contributing editor and the "Trains of Thought" columnist for "Model Railroader".He has also written nine books for Kalmbach (one per year since 2003)