A fine collection of rare and unusual colour photographs portraying a vast range of 'green diesels' at work on Britain's railways when they were the masters of the BR fleet. Detailed and informative captions give context to the photographs and help bring the days of the green diesel back to life. The diesels and DMUs portrayed in this book are now as much a part of history as the steam locomotives they replaced, making the book an invaluable source of reference for modellers and historians.