Explore Chicago Collections
https://explore.chicagocollections.org/records/?f1-neighborhoods=Loop&f5-topics=Work%3A%3ABusiness&f4-neighborhoods=Loop&f6-cities=Chicago&f2-types=Digital%20Images&f3-topics=Natural%20%26%20Built%20Environments::Railways&f7-topics=Work::Business&f8-institutions=Chicago%20History%20Museum