I think this is a rare one... Railway Supply Co used the old WofA shops in Montgomery to perform a variety of railroad- related jobs, the biggest of which was converting worn-out RS-3s to slugs for L&N. Apparently they also did at least a bit of motive power leasing, as well.
An attempt to put the best picture of engines that represent each of America's railroads. When a better picture of an engine/type is found, it will be added.