I am currently trying to get a map together for the events that occurred in and around Columbia. The more I think about it, the more sense it starts to make to me that this session would do best as an expansion on history rather than an expansion on the game. There's a lot of interesting stuff that happened in this time period and extrapolating that could make this very interesting indeed.
For example, in this time period, the book 'Dracula' was released and it is believed that a small time craze made some naive people invest in 'vampire killing kits'. Now imagine this is extrapolated to Columbia. The higher class of Columbia are naive enough to believe that vampires exist and there is the technology to make certain vampire-like powers a reality. Murder of Crows certainly has a vampire-ish feeling to it! Columbia is a city in the sky, who's citizens believe that the earth below is damned; if people were to read of vampires living below, then what would keep them from believing it's true?
We can give the 19th century literature a religious spin. Just an idea.