Unfortunately freight revenue continued to decline, and the coal mines were closed or began shipping by truck. In 1958 another 1.44 miles were closed. The remaining 2.37 miles remained in operation to serve the Hadite plant of the Carter Waters Co, located just east of 200th Ave., about a mile east of the former Midway mine. Hadite was an aggregate manufactured from shale clay to produce a light weight block similar to concrete. The blue clay in this area was quite suitable for that purpose. The hadite plant discontinued operation about 1964 and the Centerville to Mystic Interurban was no more.