A slot with an easy grade internal ramp. Named by Brian Fox to give recognition to Surveyor William Stronach Thom (1871-1918). Employed for 30 years in the NSW Government Railways. Deane, Henry. The Wolgan Valley Railway – Its Construction, pp. 5-6, records, “The new surveyors included Mr. Thom who had previously held an appointment under me in the Department of Works….Mr Thom was instructed to work up the Sunnyside route….1906.”