packing house in Hammond rivaled those located at the Union Stock Yard in Chicago. By the middle of the 1880s, when it built a new plant in Omaha, Nebraska, Hammond was slaughtering over 100,000 cattle a year and owned a fleet of 800 refrigerator cars. After Hammond died in 1886, the company became less important and no longer challenged the giant Chicago packers, who acquired Hammond at the turn of the century and merged it into their National Packing Co. The Hammond Whiting & East Chicago Electric Railway Company trolley service ran from 1893 to 1940. On June 22, 1918, the Hammond circus train wreck occurred about east of the city, killing 86 and injuring 127 persons. The downtown Hammond shopping district along State Street and Hohman Avenue included major chains such as Sears and J. C. Penney. The largest stores in downtown were the Goldblatt's and E.C. Minas department stores. The E.C. Minas store was constructed in 1894 and was in business until August 1984. The building which housed the Goldblatt's store had been purchased by the Chicago-based retailer in 1931 and operated until 1982 when it closed due to bankruptcy. The Pullman Standard Car Company built M4 Sherman tanks in Hammond during World War II. Architect Victor Gruen designed the Woodmar Mall in the Woodmar neighborhood. The mall opened in 1954 and was anchored by a Carson Pirie Scott and Co. store. According to the 1960 United States Census Hammond's population reached a record high of 111,698 residents. Hammond, like other industrial cities in the Rust Belt, went into decline during the 1970s and 1980s, with the city's population plunging to 94,000 in 1980, and 83,000 in 2000. However, Hammond's economy was more diversified than neighboring Gary, Indiana, East Chicago, Indiana, and the south side of Chicago, which all relied on heavy industry (primarily steel production). Hammond's economy, on the other hand, depended on light manufacturing, transportation & warehousing, retail, banking & insurance, healthcare, hospitality & food service, and construction. In 1981, a toxic flood in Gary led Hammond to erect a barrier on 165th Street, one of several roads connecting the two cities, which led to lasting tensions with Gary. Prominent manufacturing companies in Hammond include Unilever's soap factory, Atlas Tube, Cargill food processing, Munster Steel, Lear Seating Corporation, Jupiter Aluminum, Tri-State Automation, and Dover Chemical. Warehousing and storage is also prominent, with ExxonMobil and Marathon Petroleum