Remarks: Until the late 1990s, Train Order safeworking system had not been employed by the NSW state government railway. But, with reduced train operations, the existing systems of ETS and OTS&T for single line sections were determined to be too expensive. The computerized Train Order system chosen did pose some initial hiccups. The first section chosen for trial purposes was Orange to Dubbo, 140 km. TOs have now encroached into numerous other single line sections of NSW.