He doesn't need it. As POTUS he can choose to not suspend the ability of rail workers to strike and let the workers and rail companies sort it out. That whole

He doesn't need it. As POTUS he can choose to not suspend the ability of rail workers to strike and let the workers and rail companies sort it out. That whole capitalism thing? Instead he has used his powers to prevent a rail strike since it would increase the cost of groceries and lead to (short term) grocery shortages.