In the 1850s railroads hired thousands of working people to build and operate their growing lines. In 1857 the Baltimore and Ohio Railroad recorded every employee on the line. Over 6,000 individuals worked for the B & O in a variety of roles. At least one woman was employed by the company, Sarah Mally, as well as many free blacks and Irish immigrants. Our database will track these individuals over time and in coming months we will add more data from different railroads on slave laborers, Irish, and other workers.