1885, 325 miners in town went on strike, protesting a 20% drop in wages reflecting a decrease in the demand for coal during the summer months. Later, the United Mine Workers of America had a very strong presence in Centerville. In 1912, UMWA Local 553 in Centerville had 1194 members, making it the second largest UMWA local in the country. The largest UMWA local was in Buxton, Iowa. In 1910, the Scandinavian Coal Company drilled a 550-foot exploratory hole in Centerville, discovering a deposit of gypsum and anhydrite 10 feet thick near the bottom. The Centerville Gypsum Company was formed to exploit this deposit, and between 1912 and 1913, the company bored a shaft down to the gypsum. Water problems delayed the opening of the mine until 1917, and commercial production began in 1919. The mine was closed in the early 1930s. The Sunshine mine, about 3 miles west of Centerville (number 30 on the map), was very small in 1908, with just a horse-powered hoist at the pit head. By the 1930s, this was a large mine with an attached mining camp and a mountain of mine waste 500 feet long. The Sunshine Mine Drive-In is a theater on the former mine site that opened in 2005, but has since closed and fallen into disrepair. The post-coal era Centerville experienced its peak population in the early 1900s as the popularity of coal peaked. After that point, as usage dwindled, the coal industry that had been the community's life blood collapsed. In the 1950s and 1960s a civic movement to promote new industries began. This effort culminated in the building of Rathbun Dam, near the city of Rathbun, Iowa, forming Rathbun Lake, known as "Iowa's Ocean", that was dedicated on July 31, 1971 by President Richard M. Nixon. In June 2006 the Centerville Daily Iowegian reported that the city's largest employer, a Rubbermaid plant, that opened in Centerville in 1985, would shut down in September 2006 displacing 500 workers. In 2007, the former Rubbermaid building was purchased by Lee Container, a manufacturer of products made of high density polyethylene plastic resin. The Southern Iowa Railroad was an electric interurban connecting Centerville to Moravia with a branch to Mystic. The railroad disbanded in 1967. The Appanoose County Community Railroad (APNC) was a short-line railroad founded in 1984, operating on discarded former rail lines, and connecting to the BNSF railroad in Albia.