HairyLeg, Your KML shows a line North East from Resevoir Station in Melbourne's North Heading towards South Morang. I have never heard of this line and can't find any info.
It's not listed on the maps at http://www.vrhistory.com/VRMaps/ either.
Could you please tell me where you found out that this was a train line?
That is the Yan Yean Tramroad, built in 1855 to carry pipes and materials for the water supply pipeline between Yan Yean Reservoir to Melbourne. It ran from Yan Yean through Reservoir, and then along St Georges Rd, Brunswick St to the city, basically at Exhibition Buildings. It was wood-railed. After it was no longer needed and was derelict, it was suggested as a possible route for the railway to Whittlesea and Seymour.
An article appeared in Light Railways 20 - here is the map: