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The Chicago, Aurora & Elgin 450-series were the last "traditional" interurban cars ever built (rolled out of the St. Louis Car Company shops in 1945).
After rail service ended in 1957, both Cleveland and Philadelphia considered purchasing them for rapid-transit service, but neither plan came to fruition.
4 of the 10 cars were preserved. The other 6 were scrapped in 1963, before they were even 20 years old.