From the Maitland Mercury report:
The romance of travelling on a 1960s “red rattler” diesel rail motor will bring back memories for many visitors at this weekend’s Steamfest celebrations.
The Rail Motor Society at Paterson has restored the twin diesel engine 621-721, built in Sydney in the early 1960s.
Full article by Rebecca Berry available at Maitland Mercury, 08 Apr, 2011.