On a fall evening in 1866, three men hop on a steam train just as it leaves the depot. But they're not your average passengers – and they're not here for a ride. Their destination? The express delivery car. They open the door, Colt 45s in hand. The stunned guard follows their orders. The thieves grab the loot and leap off the locomotive with $10,000 in gold. Welcome to America's first train robbery – by its first outlaw gang.