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- Steamboats, the story of lakers, ferries, and majestic paddlewheelers, by Karl Zimmermann ; photography by the author
- Ocean liners, crossing and cruising the seven seas, Karl Zimmermann
- Burlington's Zephyrs, Karl Zimmermann
- 20th century limited, Karl Zimmermann
- All aboard!, passenger trains around the world, Karl Zimmermann ; photography by the author
- Domeliners, yesterday's trains of tomorrow, Karl Zimmermann
- The Stourbridge Lion, America's first locomotive, Karl Zimmermann ; illustrated by Steven Walker
- Steam locomotives, whistling, chugging, smoking iron horses of the past, by Karl Zimmermann ; photography by the author