The U.S. chemical manufacturing industry … forecasting billions of dollars in economic damage if a labor deal isn’t reached between rail companies and unions before a potential strike in December.  …The start of rail strike preparation will depend on the voting results from some of the largest rail unions yet to ratify the labor deal recommended by President Biden’s Presidential Emergency Board. The two largest unions, the Transportation Division of the International Association of Sheet Metal, Air, Rail, and Transportation Workers and the Brotherhood of Locomotive Engineers and Trainmen, a Division of the Rail Conference of the International Brotherhood of Teamsters, will announce their vote results on November 21. …The American Chemical Council says the impact of a potential strike would be felt almost immediately across nearly every sector of the economy. It has asked Congress to step in, using the authority it has to impose a deal under the Railway Labor Act.