The amazing thing about this footage is that it was filmed only yesterday at Montmorency on the Hurstbridge rail line. The truly shocking thing is apparently this section of track was upgraded to concrete sleepers last year.
It was uploaded to Youtube by Rocketboy 1950, who says:
I shot this footage on the Hurstbridge line at Montmorency. It is testament to how safe trains are and how they will handle extraordinarily bad track without going arse over head. This is of course not to say that some of the passengers will be going to see a chiropractor or orthopedic surgeon to have their backs put right after riding the trains through here.
Expertly placed on a curve.
Update: Channel 7 now on to this and ran this story on Friday evening news.