The first class of semi-streamlined Jubilee 4-4-4s placed in service by the Canadian Pacific were the five engines of class F2a, which Montreal Locomotive Works delivered in 1936. Their running gear was unusual in at least two respects; the main rod connected to the first set of driving wheels instead of the second, unlike the F1 class, and they had 80-inch disc drivers. As far as I know these were the only CPR engines to be equipped with disc drivers, as even the latest Royal Hudsons had spoked drivers. This image, perhaps a company publicity photo, was scanned from Rand McNally's 1951 World Railways. No. 3001 went to the torch in 1957.