The history that i know about these TTSS40's
Western Contacting kept these machines after the California aqueduct job, they split the bowls and made single bowl machines. I think the last job they used them on as scrapers was the Castiac Dam in the late 60's. These tractors are model 53LDT, only 5 were produced. During the Castiac job, they were seperated from the scrapers & hooked up to rocker end dump trailers, then when that job was complete, they workied as rocker dumps on a canal job in Arizona some time in the early 70's. When that job was complete, they sat parked untill about 1987, when Chilcote Inc a contractor from El Cajon Ca purchased them & brought them to San Diego Ca. They used them briefly as rockers, then hitched them up to Athey PW660 bottom dump trailers. Sadly they scraped the trailers about 1990. The tractors lasted untill Chiclote Inc went out of business in 1996. Then a few of the tractors ended up at American Contracting in Temecula Ca. They ocasionally used them to pull bottom dumps & then parked them in thier bone yard. I saw them about 3-4 years ago for sale at Ritchie Brothers in Perris Ca. Sadly I think they ended up in Mexico & sure who ever has them has no idea of thier history.