Paul's love of railways was triggered by taking the train to school in 1970. He developed a keen interest in rail freight and travelled widely to record the changing railway scene from the late 1970s onwards. He is the author or compiler of around 50 books, mainly covering different aspects of rail freight but also some general titles on railway history and infrastructure. He has also contributed more than 100 articles to enthusiast magazines and written around 40 DVD scripts, some covering railway operations in mainland Europe.