List of British Rail unbuilt locomotive classes (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "List of British Rail unbuilt locomotive classes" in English language version.

refsWebsite

Global rank English rank

2books.google.com

3^rd place

3^rd place

books.google.com

Allen (1981), p. 19 Allen, Geoffrey Freeman (1981). The Eastern Since 1948. I. Allan. ISBN 9780711011069.
Webb (1982), p. 91 Webb, Brian (1982). The Deltic Locomotives of British Rail. David & Charles. ISBN 9780715381106.