Johnson is a retired local government officer Johnson is known for his "meticulous research into all aspects of the [Ffestiniog] railway’s operation". In 2003 he was appointed the Festiniog Railway Company's official photographer. From June 1995 until Match 2019, Johnson contributed a monthly column of narrow gauge railway news for
Steam Railway magazine; as of September 2017 he was the magazine's longest serving continuous contributor. Since 2006 he has written obituaries of prominent railway people for
The Guardian newspaper. == Works ==