Robert Leffingwell supplied this transparency of Baltimore & Ohio T-3 4-8-2 No. 5579 resting in the terminal facility at Willard, Ohio some time prior to its 1956-57 renumbering to 721. The occasion seems to be one of the railfan excursions the B&O operated during the waning days of steam. The T-3 class employed the Baker valve gear; the boiler, tapering towards the front, is evidence of the fact that the railroad's Mount Clare shops built these locomotives using the lengthened boiler shells of old 4-6-2s and 2-8-2s. While No. 5579 has a standard tender, some of the T3s had an extra-long Vanderbilt tender which enabled them to make longer runs without stopping to take on water. For the T-3 class specifications, see the commentary on No. 725. Sunday River Productions' video Baltimore & Ohio Steam features some excellent cuts of the T-3s at work on the B&O's speedway across Ohio and Indiana.