Since its in California the enviromentalists may stop you for burning wood or fossil fuel (coal) and CA safety folks could have a problem with pressurized steam vehicles on crowded public roadways. CA is pretty picky and full of rabid tree huggers just waiting for a chance to pounce. Hate to be negative but I am betting you would have to pull the unfired steamer with one of the classics to get aproval.
Probably have better chance getting them in the Macy's Thanksgiving parade in NYC as I think I have seen a steam caliope in it.
Hope I am wrong!!