1. North Geelong (Thompsons Rd) to Moorabool is duplicated with one track being dg and the other sg . (The dg is on the South side from Thompsons Rd to Anakie Rd and then on the North side from Anakie Rd to Moorabool.)
2. Whilst the Moorabool viaduct has been prepared for restoration of a second track (minor strengthening works) and earthworks were recently also completed between Moorabool and the Up end of Gheringhap for installation of a sg only South track, this work is to be completed at a future date .
3. In the dying days of ANR a series of tests were conducted in South Australia with freight vehicles of both bg and sg within the same freight train consist at speed on dual gauge track . The trials were quite successful , but the practice was not adopted generally .
4. Dual gauge is where a common rail is installed over 3 total rails . Where the two gauges are separated with 4 rails it is called gauntlet track . The only example of gauntlet track in Victoria (and soon to dissapear) is the bg/sg gauntlet track on the Up East Suburban Line over Dudley St , West Melbourne.
5. The speed restriction for bg trains on dg tracks in Victoria (of usually 80kmh) is related to the risk of derailment potentially caused by any brake rigging, brake blocks falling in the narrow gap between the rails . Above 80kmh in a derailment any damage is much greater .