Elgin Union Depot was built jointly by the Houston & Texas Central and Missouri Kansas and Texas (MKT or "Katy") railroads in 1903. It replaced a small wooden depot built in the 1880s. Olle Lorehn, a Swedish architect in Houston, designed the new brick building. Interlocker Tower #100, which housed the telegraph office and the switch levers, were built at the RR crossroads in 1913 and demolished in the 1970s. Passenger service ended in 1957 and the depot building then served as the Elgin Police Department from 1960 to 1990. After a lengthy period of fund-raising and restoration, the building was opened as the Elgin Depot Museum in June 2002. It is operated by the Elgin Historical Association.