Someone forwarded me a link (below) to a YouTube video of 8mm home movies taken on a trip on the B&O, including the "Cincinnatian", in 1947. You might be able to spot more, but I also saw in there a EM-1, Southern PS-4, and one of the C&O streamlined Hudsons! Not always of the best quality, but some really rare stuff! I believe some shots near the end are inside the train shed at Baltimore, Mt. Royal station. Hopefully not a repost, but worth another look if it is.

Link: http://www.youtube.com/watch?v=VyoOTgqM76Q