Bombardier bruised on two fronts with threats to trains, planes

Bombardier Inc.’s turnaround plan is coming under threat from stepped-up challenges to the company’s rail business and its cutting-edge jetliner.
The Canadian manufacturer risks being jilted by Germany’s Siemens AG (ETR: SIE), which is now exploring a rail-equipment deal with Alstom SA (EPA: ALO) of France after months of talks with Bombardier. Separately, the U.S. government is set to decide this week whether tariffs should be imposed on Bombardier’s CSeries aircraft aft