Exactly $0 of high speed rail infrastructure was funded by sales taxes. State dollars came from prop 1a and cap and trade funds. About 12B over a decade and a half for heavy engineering, land acquisition etc. if that money was not spent it would have a negligible impact on your taxes.

Everything the California government does has a negligible impact on my taxes. However, the sum of it is not negligible. I'd rather them not waste money because it's "negligible".