"It took four men to hold a big iron bar to manually drill a hole into the granite," said Hsu, director of research for Stanford"s Chinese Railroad Workers in North America Project (CRWNAP), which seeks to shed more light on the experiences of Chinese railroad workers. "A fifth man would pound it with a sledgehammer. Then they would rotate the bar a quarter turn and pound it again, and so on. This was how they drilled the hole to then pack the black powder, light it and run. There were no hydraulics."