Peter Semmens was formerly Deputy Head of the National Railway Museum, York and has been active in the popularization of science and technology for many years. He has written more than 30 books on railways and locomotives and is now Chief correspondent of The Railway Magazine where he contributes the monthly 'Railway Practice and Performance' column.
Alan Goldfinch pursued an engineering career with British Railways, and was for a time the Chief Mechanical and Electrical Engineer of its Eastern region. His final appointment was as a Electrification, Plant and Machinery Engineer at Rail Board HQ.