I recently visited the B & O Museum in Baltimore for the first time. It was a great experience! I was very impressed with the mass of the "Allegheny" locomotive, built by Lima. It was used to carry coal, I believe, and some passenger trains. It is a machine of incredible size and power. I believe it was the most powerful engine ever built in the US. It dwarfed most of the other trains at the museum. Only 1 or 2 survive. It also had incredible detail of pipes and valves. I could not find a lot of information on the web. Do you have any information or pictures?