Thomas Osburg has some wonderful resources about the Upper Yarra Track and other Yarra Ranges matters at his excellent website here: http://www.yarrarangesbushcamp.com/ (see also under ‘More’), such as this photo from http://www.yarrarangesbushcamp.com/yarra-track-1895.html :
There you will also find reports of a 1928 expedition (with lots of interesting photos): http://www.yarrarangesbushcamp.com/warburton-to-walhalla-1928-easter-expedition.html
Also see some interesting photos of the “O’Shannassy Aqueduct Trail which (I believe) forms an alternative walk to part of the Warburton-Lilydale Rail Trail (to Millgrove at least) : http://www.yarrarangesbushcamp.com/oshannassy-aqueduct.html (& also see:http://parkweb.vic.gov.au/explore/parks/yarra-ranges-national-park/things-to-do/oshannessy-aqueduct-trail)
He has HUNDREDS of enchanting historical photographs, eg here: http://www.yarrarangesbushcamp.com/historic-photographs-yarra-ranges-national-park.html
also this excellent sketch map of the Yarra Falls vicinity (which should be viewed in conjunction with 25K Vicmaps: Matlock South 8122-4-S and NoojeeNorth 8122-3-N):
