Here’s the blurb for The West Wind:

Rachel West and half brother Clarence emigrate from Post-Victorian London to the American West and are swept up in intrigues fueled by greed, resentment, and the need for revenge in this steam/hydrogen-punk tale dominated by plots and power struggles between rich and powerful industrialists.  It is a world of massive floating mansions, horses, stagecoaches, airships, private railroad cars, dusty western towns, flying machines, and marvelous traveling mechanical freak shows.