The Sangamon Ordnance Plant was a United States Army ammunition manufacturing facility constructed and operated during World War II.
It employed thousands during the war including many Woman Ordnance Workers (WOW) and produced 20, 57, 75, 90 millimeter as well as 3 inch (76 mm) armor-piercing and high-explosive artillery shells.
These cars apparently were used in numerous Defense Plant installations around the country including in the San Francisco Bay area and at Little Rock, Arkansas.
[1] In October 1942, $20,000 cash intended for the payroll of the two ordnance plants was stolen from a courier en route to the Farmers State Bank of Illiopolis from the Post Office.
[2] In August 1943, an artillery shell exploded at the Oak ordnance plant, killing Maurice Pryor age 22 of Springfield and injuring ten others.