Small hard-cover book with 153 color illustrations. Of special interest is Nock's detailed account of the technological and sociological background of the transition.
Oswald Stevens "Ossie" Nock was a British railway signal engineer and senior manager at the Westinghouse company. He is best known for his prodigious output of publications on railway subjects, including over 100 books, as well as a large number of more technical works on locomotive performance.