Input (grade 13): In 1929 the Palmerston and Pine Creek Railway was completed from Darwin as far as Birdum, while the Great Northern Railway had been completed in 1891 from Port Augusta as far as Oodnadatta, South Australia, south of Alice Springs.
Output (grade 8): In 1929 the Palmerston and Pine Creek Railway was built from Darwin as far as Birdum, Northern Territory.