Investors who have been burned by holding onto coal stocks this year may finally be feeling the right type of heat. Coal stocks started heating up Friday, after China announced a $156 billion commitment for improving the country’s roads, rails and other infrastructure. With China planning 55 new major infrastructure projects, investors are betting that those projects will rev up demand for coal, which China uses to make steel for its bridges. Coal China’s news gave at least one StockTwits trader a reason to pat himself on the back.