A watershed design in steam locomotive technology was the Chesapeake & Ohio's T-1 class, represented here by No. 3008 in a photo taken on August 16, 1939 at Fostoria, Ohio. These forty 2-10-4s came off the Lima Locomotive Works erecting floor in 1930. At that time the C&O was controlled by the Van Sweringen brothers of Cleveland, who controlled several other railroads including the Erie. The Van Sweringens' Advisory Mechanical Committee apparently based the design of the C&O's T-1 on the Erie's S-1 2-8-4 of 1927, lengthening its dimensions. With 69-inch drivers — only an inch in diameter smaller than those of the Erie Berkshires — the C&O's T-1 was a higher-speed version of the "Texas" type than the previous, lower-drivered examples Lima had produced for the Texas & Pacific and the Chicago Great Western. For the specifications of the C&Os T-1 class, see the commentary on No. 3013following. The photo, photographer unknown, was saved from a discontinued Flickr site.