What happened to the fallen Mercury bronze atop Union Station?

If you know where to look, there's a god frolicking amid Nashville's skyline. It's the mythological messenger Mercury, gleaming at the top of the Union Station clock tower. But he's had his share of ups and downs, and once fell in 1952. WPLN listener Christina called to ask: "We have a very primitive replica up there. But the original, I'm wondering where it could be!?" Curious Nashville chases…