A gut punch to the US economy looms just in time for the holidays. American railway union members rejected a labor deal brokered by President Joe Biden earlier this year, increasing the threat of a strike by as soon as Dec. 5. The impact would be far reaching: rail remains a key way to move goods and raw materials around the country. A strike would most likely exacerbate high inflation and return the country to the kind of supply chain chaos it recently faced as a result of the pandemic….